This oppressive heat has been especially bad for us with MS. The biggest effect heat seems to greatly increase fatigue. Heat can even cause pseudo exacerbations that will subside once you cool down. My experience has been cooling two parts of my body helps cool my entire body. One is your neck. If you don’t have a cooling scarf, you can put a wet hand towel in the freezer to get it cool. The other one is your wrists. I have found that my cooling wrist bands help keep me cool. The MSAA has a cooling vest program that will send you a vest/scarf for no cost.
Stay cool & enjoy the day, Ray