Hello Julie,I’m sorry to hear that your treatment has not proved efficacious, but glad to hear that you are still determined to pursue options for remedial action. It sounds like your case is much more complex than mine which has only ever been occupational. I have never been in physical pain through dystonia nor affected away from the piano, and there has never been any doubt about the affected muscle which is largely under control once more. It sounds like piano retraining is out until your persistent arm cramps subside. Hopefully a qualified rolfer will assist in calming the afflicted muscle(s). I do hope so.
Best wishes - Paul