I had menningitis (from Lyme disease) 2 years ago. Even a slow walk has to be done in shorts and tee shirt at 45 degrees - and still sweating. Summer, 90 degrees, 90% humidity - an absolute nightmare. And it continues to worsen. I drink a gallon of water (hot weather) an hour and still dehydrate. And still my doctor says it's all in my head. Probably because he can't figure out what's wrong. I need to figure this out before I collapse and have a life threatening event occur. Please help.