My allergies are sulfa and penicillin drugs, apples OAS, numerous environmental and indoor allergens (tree pollen, mold, dust, etc.). Only animal issue is birds.
When I became penicillin allergic a few years ago, my reaction was like this: rash and hives head-to-toe, and it lasted five days. Same deal of needing to take 50 mg Benadryl every four hours. The allergist was threatening me that it couldn't go beyond five days or I'd have to take prednisone.
In college, I had my first allergic reaction. I developed red spots all over me following taking a sulfa medication for a sinus infection. It was not a prolonged problem or a big deal.
Yes, I'm very tired from all of the Benadryl. I sleep basically all day, unless I get so itchy that I can't sleep. I'm up now waiting to take my next dose at 11:15. My feet are too itchy to sleep, and I see there are hives on them.