I suffer from a neck and shoulder injury from 18 years ago and sometimes find I have to quit for awhile, go do something else and then return to sewing/quilting. Found that if I have machines set up below shoulder level I do better. I just do what I can as long as I can and then change positions or do something else for a short period then go back to the sewing/quilting.
I would check with dr and therapist before I set up anything to cause you the least amount of pain.
delma