Are you on statin drugs such as lipator or zocor..and did your pharmacy make you take the generic which is simvistatin? I had a huge problem with this especially in my hand. First I stopped taking the lipator and it subsided withing a day and stopped with two days so dr switched me to zocor same thing then I realized it was the GENERIC statin that did it. He put me on crestor and I am not on the generic and so far no problem.