Sulfa reactions can indeed be very severe, even life-threatening. If you had such a reaction, and it appears you did, you should never be treated with sulfa drugs. SAuch reactions can be from even tiny doses, so the drug doesn't have to "peak"--actually be in your system for a while for the reaction to happen.
If the drugs you took recently contained sulfa, pease make sure aany doctor who takes care of you knows that you have this problem. If you avoid sulfa, you should be OK--other antibiotics are chemcially unrelated.
Best.
Dr. Rockoff