I know Alike Wisdom, I was the user that commented that on Muffinman's post, but thank you for trying lol

No idea as to WHY. Heat intolerance is definitely a possibility with autonomic dysfunction. It definitely is for me. I know that i used to love 85-90 degrees. Itis one of the reasons that i dont have air conditioning in my house. I've been too hot and too cold within minutes of each other, so it really isnt the temperature, I think it is position. Fan helps me. I have several small usb rechargeable fabs. So i can put them anywhere, anytime, and light breeze, effective but not overwhelming. Ideas: like mentioned earlier, plus: Shower and bath is a great way to cool down. Swimming is too much of a shock for me, so i start in the shower, start out warm and then cooler, than bath in that cooler water for another few minutes. Anything that causes evaporation from your skin will help. Wet washcloth along neck, especially back of neck. Shorter hair style. Menthol, like icy hot, on forehead. I highly suggest finding a work from home job. It has been a lifesaver for me. Im sure without that, i would have had to file for disability. Even without airconditioning, at home, i can take immediate remedial actions to stop the snowball effect.

It could be that your body has gotten use to the 71°F temp. Especially if your using ac. I am extremely heat intolerant (I also have Erythromelalgia) and I'm not comfortable unless it's 63°F. It's miserable bc the only place I can have it that cool is in my house and maybe my car. I try to keep my house closer to 65-67 during the day. Sometimes having no air blowing with it being 63° in my house feels warmer than air blowing and it being 67°. Ambient air makes a big difference

Fyi, my niece found a rechargeable fan that you wear abound you neck. She loves it. She has Narcolepsy. For me, its a NO. It excites my tremor too much.

Just guessing but a couple ideas. Try icing or cooling down parts of your body, like your left hand. Then switch to heat for about 10% of that time. Then back to cold. It could help you find a partial solution and maybe help your body start working because of experiencing the fluctuations but on a limited scale.

Kind of like some of us with POTS have increased our standing ability by repetitive short standing and variations of upright.

Plus useful links at the bottom

similar here. Mine started with tremor, then heart meds trial caused more issues and started the last 30 years of migraines and CF followed by Fibro. Imitrex injections helped clear the CF & Fibro. Breast Cancer Chemo (8 years later) helped clear the migraines. Single Lupron "monthly" shot brought migraines back at full force. Last 4 years has been POTS/dysautonomia, another breast cancer. I did physical therapy (eye and relaxation) for the 3x migraines after surgery. I might be speaking too soon, but it seems like POTS is significantly lifting. Still a lot of the dysautonomia but able to stsnd more than 5 minutes. Lot of the progress appears to be from following a lot of others suggestions. #1) dont overdo. #2) small exposures. So my suggestion was just cooling and warming of one hand. For me and migraines, i started with a make-up round (3" diameter), used just that much area against a temple area. After about a month or 2, i added the 2nd temple. I can now do the whole face.

My temp is never stable. I'm always too hot or too cold and there are times I'm so cold I can't feel my toes or fingers.