I was on amoxicillin over 1 month ago and developed hives from it. Was put on prednisone and half way through that I started having severe rotating joint pain. Started in L wrist, then R shoulder, L shoulder, R. Wrist then left fingers. Pain is intense and goes up or down arm , last several hours. Next day it is somewhat better and by third day everything is okay until next episode starts usually a little over a week later. Blood tests were performed for Lymes, lupus, liver profile. Everything negative. Any idea what might be going on?