Allergic to peanuts symptoms and conditions

Allergy, not side effect.
62 yr. old male. diagnosed with lung infection associated with smoking and was prescribed 5 x 500 mg Levaquin. I took one with water in the parking lot of the pharmacy. With-in 20 minutes I started getting burning, tingling feelings in my throat and mouth. I drove home , by that time I had huge hives on my back and buttocks. I went back to the doctor immediately.
Other than a rapid heartbeat, the only symptom seems to be the hives which were huge and covered my whole body.The Dr. stated that the episode occurred too soon after I took the pill to be an allergic reaction to the pill, however, I had not eaten or drank any thing that morning other than coffee. I also did not eat anything exotic the day before. I was given a steroid injection at the Dr. office and was prescribed a steroid med pak and an antihistamine. With-in 3 hrs. all the hives were gone. It is now 11 hrs later and I am ok except I am drowsy. If I do not recover well, I will post again to advise.