I began taking sulfameth about 1 week ago. Everything seemed ok ...

I began taking sulfameth about 1 week ago. Everything seemed ok until one morning I woke up and my neck was completely stiff! I started getting the hot and cold feeling and a splitting headache with nausea. I took tylenol and it seemed to improve a little. That evening I woke up every ten mins, just unable to get quality sleep. Next morning I woke up (after no sleep again), COVERED in hives. I mean, from my head to my ankles, these huge, red, itchy things all over! My throat, too. You know how it feels right when you swallow?..that's how my throat felt constantly. I was completely freaked out as hubby was at work and I was home alone with my 4 kids. So we hauled booty to the clinic and sure enough, allergic reaction to the antibiotic. I'm actually allergic to penicillin as well, so the doctor I saw said she was really surprised my other doctor would have prescribed a sulfer drug to me as it has a high instance of causing allergic reactions. hhhmmm...thanks. Anyway she said I could take benadaryl, but better yet, Claritin. She said Claritin won't make you drowsy and will knock it right out (you should take benadryl instead of claritin if you're breastfeeding though). That was yesterday, and besides some weird mottled look on my legs (leftover rash), all seems well.