Allergic Reaction

I spent a long time in the E.R. last night with another allergic reaction.  We didn't get home until 5 a.m. this morning.  We have no idea what caused the reaction.  This is not uncommon for me.  While there, I had my medications through the IV and when I received the liquid Benadryl, I got very light headed and couldn't breathe.  I sure hope I'm not allergic to Benadryl.  It's my life-saver.  It's bad enough I'm allergic to Prednisone.  That was the anaphylactic reaction in November.  So today I'm recuperating.