Yes, I'm also allergic to or have bad reactions to some medications. After a lifetime of using penicillin, out of the blue I had a reaction with hives, shortness of breath and palpitations.

Penicillin
Erythromyecin
Interferons
Solumedrol

When I was a kid, I had alot of allergies caused by environmental triggers. Surprisingly, they discovered I was allergic to my own cold germs so every time I caught a cold, it went into pneumonia.....five times in 1-1/2 years....age 4-5. Thankfully my mother had been a nurse so I was able to stay at home with the doctor coming for a "house call" After years of allergy shots and growing up, I seemed to outgrow them....thank goodness!

Being allergic to my own cold germs sure sounds like a precursor to MS raising it's ugly head in later years. It does make you go hmmmmmm