hyperhidrosis
"Thank goodness for a diagnose! And oxybutynin. 
 The truth is I have hypothyroidism which gives me terrible temperature fluctuations. I can be cold then I can be hot and so on. I also have fibromyalgia  which is autoimmune disease. And  last annoying temperature changer is ranaulds.  Another  pesky temperature changer that affects your nose, fingers and toes. 
I told my doctor about my reading about oxybutynin and how it treat temperature changes.
 I started on 5 mg of  Oxybutynin  that was a little too much for me. So I take 2.5 mg in the morning. And I'm good for the day.
  I dripped, change clothes three times a day, sweating at night, and now I'm free."