Do you have LYME disease where you live? I would ask about that too.Have your doctors tried prednisone or any other type cortico steroid? Steroids can be very beneficial as polymyositis is an auto immune disorder.Are you seeing a rheumatologist? Good luck and hang in there!
Its not that prednisone is addictive, but it shuts down the adrenal gland production of cortisol so tapering it SLOWELY is critical. I have my patients taper by no more than 5mg every 5 days. This slow taper makes it much easier to tolerate and safer . The adrenal gland needs time to get back to production via the axis to the brain.