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To better define what I mean by “heat intolerance” so you can compare it to what you experience: if I get even the slightest bit too hot, I immediately begin to pour buckets of sweat and my heart rate goes through the roof. I get really nauseated and shaky and feel so unsteady and sick that it’s like my brain shuts down and I have to lie down or I’ll lose consciousness.
Dysautonomia is dysfunction of the autonomic nervous system, so anything the ANS controls can be impacted, which is all the automatic bodily processes we don’t consciously control. So stuff like temperature regulation and sweating, tear and saliva production, bladder function, heart rate, blood pressure, pupil dilation, breathing, sleep, digestion, hormone release, blood vessel dilation and constriction, inflammation levels, etc. 
My main symptoms that sent me to the doc were: crazy heat intolerance, debilitating fatigue that had me bed/couch-ridden and avoiding even drinking anything at times because I didn’t have energy to get up to pee, intractable insomnia, periods of days to weeks of not being able to eat solid food, excessive sweating for no reason (I begin dripping sweat just standing up for more than 60 seconds), tachycardia upon standing (my HR would be 170-200bpm after a 7 min shower for example), random sudden bouts of high blood pressure that would then go away just as quickly, gastroparesis, vestibular migraines that felt like carsickness on steroids and made it literal torture to move, dry mouth and eyes, trouble emptying my bladder, difficulties regulating my temperature, horrible brain fog, and more. 
I had a bunch of endocrine stuff ruled out first by an endocrinologist (I do have some potential early thyroid issues, but nothing that would be at all responsible for my symptoms). Got sent next to a cardiologist who checked my heart out and my heart is totally healthy. Finally ended up at a neurologist who is an autonomic specialist. He did a tilt table test and some other autonomic testing and I was diagnosed with Dysautonomia manifesting as Postural Orthostatic Tachycardia Syndrome (POTS) and Inappropriate Sinus Tachycardia (IST). 
Since then I’ve also found out I have something called Mast Cell Activation Syndrome (MCAS), which is a common comorbidity with Dysautonomia/POTS. You know those people who are so allergic to everything that they have to live in a literal bubble? That’s MCAS, though the most severe version. Thankfully I’m not that severe. 
The probable cause of both the Dysautonomia and MCAS for me is hypermobile Ehlers-Danlos Syndrome (hEDS). POTS, EDS, and MCAS go together so often it’s called “the triad”. EDS is a genetic connective tissue disorder that impacts connective tissue all over the body and causes hypermobility and all sorts of issues, depending on the type of EDS. I partially dislocate my hips and shoulders frequently just doing normal, everyday things. My skeleton isn’t held together as tightly as it should be, so lots of all over joint pain and muscle pain from my muscles trying to compensate for my loose connective tissues. 
Anyway, apologies! That was a super long response to your question, but I try to be really thorough when talking about this stuff because I KNOW there are people out there suffering with one or more of these typically unknown conditions (crazily enough POTS is considered unknown, but it’s more prevalent than MS!) 
So I always elaborate just in case it gives someone reading a lightbulb moment!
Edit: spelling and punctuation
We started a Christmas tradition a few years ago - we bring 'presents' to the local animal shelter. 
Dogs get treats, toys, bones. Try to take them all for a walk so they can get outside for a little bit. >

Lights up ✔️  Shopping done ✔️ Tree decorated ✔️  
Merry Christmas. >

Merry Christmas 🎅 >

Just want to wish everyone a safe and happy holidays! >

Home Alone is the best Christmas movie.
The only acceptable counterargument is Home Alone 2. >

Mr. Robot Season #4 >

The sunflowers I didn't even plant are now 5'6" tall and are sporting yellow flowers, despite a straight week of freezing mornings. I have wrapped a Build-Yer-Own Skateboard kit for one of my nephews, and have also included wrist guards in case his dad raises an eyebrow. Soon I will get some applewood chips rolling in the smoker so I can start prepping an elk roast and some duck wings/legs/hearts for tomorrow's supper.
So many folk on the horizon... my wife and I each have five siblings, and they have 10 children between them, one of which has three of her own. I think I've spent more on gifts than on rent this month, and I hope to retain my Best Uncle Ever title for the 22nd straight year.
Happy whatever you celebrate, mes amis. I hope it's lovely. >

An ELK roast? That's another thing I need to add to my "meat I need to try" pile along with goose and gator. >

I shoot one elk a year up in Oregon. I hunt duck for 100 days in the winter, I take one hog, I take two or three turkeys, I fish as many salmon and halibut as I can in their seasons. Sometimes I buy chicken just for a change of pace, but it's genuinely been about four years since I had to support what I consider to be a largely inhumane and unclean meat industry.
I'm so happy I'm able to do it this way. >

Just here to wish everyone a safe and happy holidays! >

Nightmare Before Christmas gets my vote. >

Being seriously old, I think the '47 version of Miracle on 34th Street is #1 and really miss Amahl and the Night Visitors. then there was a 1-off with Art Carney as a bum who gets to be Santa for one nite, but does such a good job, he's given the permanent position - probably from the early 50's - Just did a search, and this was probably on The Twilight Zone! >

It was a Twilight Zone episode and I think Natalie Wood was the little girl in the '47 Miracle on 34th Street. >

I have played a fucking alarming amount of Disney Dreamlight Valley since installing it about 7 days ago. Alarming amount as in, have completed literally every single quest except Stitch's (he is hard gated beyond IRL days played). It is pretty addicting, and scratches the Animal Crossing itch super well.
While waiting for more content to drop in there, I'll get through some other backlog games. Currently as I type this playing "There is a Genie in my Szechuan Sauce Remastered", which is a goofy-ass sketch video with like 5 choices to make that I'll platinum in 20 minutes. 
Also really need to play more Pokémon Violet, I've only beaten the first 2 gyms. The deceptive nature of the leveled "open world" really turned me off, having to look up maps online of where it actually wanted me to go. >

Play High on Life.  It’s on Game Pass. >

I've mostly heard bad things about that game. Also my Xbox collects dust lol, I'm a PlayStation/Switch guy >

Serious question, how bad is 95N from Delaware? >

It’s -9° outside right now and this is my second winter of having severe heat intolerance thanks to Dysautonomia (POTS and IST). It’s SO weird to be comfortable and not absolutely freezing my ass off when the furnace is having trouble keeping up with warming the house. I used to always be so cold and now I have to readjust my whole temperature regulation routine and it’s so weird! 
As for Christmas movies…does anyone remember this one? It wasn’t my favorite, but I remember seeing it a lot every year as a kid and no one else I’ve ever asked about it has heard of it! >

Do you mind if I ask how it was diagnosed/what kind of doctor you saw for the severe heat intolerance?