Hi Kate. Thanks for your input. I REALLY appreciate it. I have been wondering lately if I have progressed to MS. Something to think about. Not sure if this is any help, but I cannot tolerate the heat at all. It brings on all my symptoms such as super dilated veins, SOB, tachycardia, weakness, etc. When I “burn up”, I do not sweat at all, and the only relief is to whip off all my clothes. However, I do have the ability to sweat (like in a really hot tub for example). I am wondering what all of your symptoms are? Maybe I have some of them too.