I have had dystonia in my feet and my toes just curl up into a tight ball. I recently made the connection that it happens when I get stressed. It is an anxiety response. CS talked about some of the drugs and mentioned Kloponin or what ever... generic name of a benzo called clonazipam I do believe. I have a med called Clobazam (brand name Frisium) I'm in Canada and you must have it in the States under a different name. But it works like magic for me. I have had this med for 4-5 years now. Your problem may be anxiety related... and we all know what that does. It causes us to seize up our muscles and if we can do it long enough or hard enough we generate pain.

Something to think about.