What would cause an allergic reaction...

Ok not trying to go for a diagnosis just some input . I have severe allergies to fish/shellfish and flax. This week I have had a bad reaction, on monday I had sunstroke and had a stomach ache and used pepto-bismol but ended up vomiting then the next day I had my tooth pulled and was put on penicillin. Thursday I started my allergic reaction, I start my reactions by getting millions of tiny blisters from head to toe but it becomes a severe reaction with the blisters after I get exposed to my allergen a few times. My severe reaction is when my face swells. Anyways, I know I can get away without taking pepto ever again but should I include penicillin to my list of things not use again. Not seeking medical advice just WWYD?
Just my opinion (need to see your doc, as you know ).... I wouldn't take it. I have a long list of sensitivities to meds- not all actual allergies, but they made me miserable enough to never want them again, or risk some anaphylactic reaction.... there are a lot of antibiotics to pick from

Do you have insurance that covers an allergy screening? If I were you I would avoid those things until you consult a specialist and get a test. Obviously if you can't find out for sure, better safe than sorry.

I see my Dr on tuesday, he was away on vacation this week. Last time I was skin tested for allergies my allergy to shellfish/fish completely didn't show up, which is not uncommon with food so IDK if it works the same with drugs.

It can- allergies can turn up after years of using them without any problem.

I suggest that you discuss it with your doctor.....only he can give you advice concerning your health....feel better

Please see your healthcare provider. We cannot provide medical advice. We wish you well.