An unexpected trip to the Dr.'s-hosiptal

Well just when I feel great something comes along. It is a minor blip on the radar screen. yesterday am I awoke with a horrible-itchy rash. I had been feeling extremely fatigued, ached and had a sore throat with a dry cough but no fever etc. I wondered if i ate something but I could not put my finger on anything unusual in my diet or routine. So after PT it kind of went away. I had taken benodryl and thought it was leaving my system. Then I took a 3 hour nap and awoke still very tired but the rash was still slight. We had a power outage form noon till 9 pm so I did not look in the mirror until I awoke at 4 am itching and found huge hives all over my body. I took two more benodryl and went back to sleep. Then at 8 am I looked in the mirror and it was much worse. It even had a strange pattern like I was scrathec in some areas or there is a straight line of rash in one area and just a patch of hives on another. Weird right? Then I started feeling worse and called Dr who said come in right away. He looked at it and ran a bunch of labs and took urine but truly we still have no idea what I am having an allergic reaction to. I thought it could be shingles but he did not seem to think that. If it is something I have been taking and just created and antibody to then it could cause this or the thought occurred I could be allergic to the bone graft material they put in hip??? No answers and I have a slight fever. I will remain resting so I can make it to therapy in am and our last education-support program is tomorrow eve, I have food to take and want to be there !!!! More benodryl is all he said to do and wait to see what happens.