Hi Dr. , My husband is on 20mg of simvastin. For the last year or so he has had night tremors that are quite severe. Recently, in the last couple of months he has developed a severe pain in his right calf muscle. He went to urgent care thinking it was a clot and was sent to the hospital for a test but nothing was found. Still, the pain persist off and on. On his last visit to his regular Dr. he was told to drink more water. Water is all he drinks, so I don't think this is the answer. Sometimes, the pain is so severe he can hardly walk. And it's worse when he get up in the morning. Can you give us any insight as to what might be causing both of these conditions.