Allergic reaction

Kyle had a severe allergic reaction to something this past week. The doctors think possibly from peanut butter... but he has had PB several times in the past without a problem. They say he can develop peanut allergies.. but we are still not sure. Anyway, it started on Tuesday afternoon about 3-4 hours after ingesting a PB cookie. He woke up from his nap with a rash all over his body & pruritic. The rash was actually red blotchiness all over. He seemed to feel ok and not running a fever- so I gave him Benadryl and he improved. On Wednesday morning, he woke up with the rash even worse and his left eyelid was swollen 1/2 shut and some facial swelling. I took him to Urgent Care and had him treated with antihistamines. They gave me script for pred if it got worse. Well, the rash never went away and got way worse that evening. I gave him more antihistamines & pred but his face started to swell up again. So, I took him to ER. The gave him more steroids and epinephrine. Since then his rash has slowly been getting better with intermittent hives all over his body. He is 95% better today with only a little itchiness. Unfortunately for me, Benadryl and pred make him like a kid on crack who drank a pot of Starbucks coffee. To say he is "wired" is an understatement. He is so jacked up - he just runs around the house bouncing off the walls. We had him rechecked by our regular doc on Thursday who has put in a request to see an allergist. In the meantime, he has ordered a bunch of tests which I need to do this week.... CBC, Celiac Panel, Metabolic panel, stool cultures, etc.... We are still having some issues of intermittent diarrhea & vomiting- so we are still trying to sort out all his GI problems. I'm attaching a few photos of the allergic reaction - didn't get a picture before ER b/c I was too panicked.