I had a similar problem with my legs and feet. They would cramp so badly at night that I sometimes had to have my DH straighten out my feet as they would cramp sideways. I was afraid I had Fibromyalia. My feet hurt from the heels forward into the arch so badly I stopped going places. It was agony to go down to the maibox. Driving in the truck was very painful. A relative of mine sent me an email about thyroid medications. I had been taking levothyroid for about a year. (about the same length of time as my symptoms) I read aabout all the side effects this generic drug has. I had all of them. Weight gain ,headaches,stiff neck, painfull muscles and muscle spasmism. I never thought about it being my medication. I went to the doctor and show fher the print out of these side effects. She knew I had been complaining about this for quite awhile. I told her that I wanted off this meidcation immediately. She put me on another name brand medication. I started taking it the next morning. Within two days most of the symptoms had disappeared. DH and I had gone into town a few days later and when we were getting out of the truck I said to him You won't believe it but I can walk without pain. My doctor still doesn't believe that the generic pill caused all this but I have not had any more problems since changing this medication. Get to your doctor and check it out. All you have to lose is your pain.