do you know how thin your blood is? i am not very knowledgeable in bp but if you are standing and sitting logically because blood is affected by gravity if you are on too much hbp meds (thins blood) your body might have an issue keeping it out of your legs which would also explain why sleeping helps it but again not my area of knowledge just an opinion.
started working my legs are swelling i am on high-blood medications. since i started working my legs are starting to swell. i am on 4 medications for high-blood pressure which i take faithfully. i do move around a lot at work but i can sit down on a regular basis and elevate my legs also. my left leg seems more swollen than the right. swelling goes away after sleeping. starting to become concerned. check regularly my pressure numbers are good 120/95. am overweight but losing weight was 250 lbs now 235 lbs and losing.