I Have Been Taking Zoloft For A While And Recently

I have been taking Zoloft for a while and recently had surgery on my foot. For pain medication they gave me Tramadol. I have since been sweating, fever, and shaky. The biggest problem is I am very itchy and when I scratch it immediately starts burning and bleeding. I have a lot of these blisters all over. I stopped taking the tramadol on Sunday, but they are not going away.