Good question! I can trace heat intolerance back to age 7. I was playing outside in the hot summer weather while mom was fixing breakfast. After a half hour or so I came inside feeling very nauseated and lightheaded. I distinctly remember sitting on the floor in the kitchen trying to cool off and feeling like I was going to pass out. As a young teenager I tried to sunbathe. About the most I could tolerate would be an hour then I’d have to come in and take a cool shower and sometimes a nap.

At age 17 I got mono and was slammed with the fatigue bat that never went away, in addition to other symptoms such as numbness down the back of my legs, numbness and tingling in hands and arms, face, etc. I remember the guy I was dating when I was 19 thought I was cheating on him because it seemed like every time he called I was taking a nap. LMAO, I WAS taking a nap!

I had several more issues throughout my 20’s, including chronic UTI’s. I helped a relative move in the dead of summer and they had no A/C. I got really lightheaded and nauseated. When I got back to my apartment I was standing in the kitchen over an A/C vent and passed out. Came to a few minutes later having no clue what just happened, got up and walked into the dining room and passed out again! Just thought it was heatstroke.

Any time my vision would become blurry or it hurt when I moved my eyes, I chalked it up to eye strain not knowing it was actually optic neuritis.

After one helluva exacerbation that attacked my vision – double vision, nystagmus, etc., I was dxd. at age 33 with RRMS.