I have had exactly this since August last year - and it too is driving me crazy ... pain continually in spite of taking Zomorph, Naproxen, Amitriptyline, Steroids (3 course of tablets, plu 2 failed injections) and also Oral Morphine for when it's extra painful - plus now Citalopram as the chronic pain has cause depression! I have every sympathy .... have you had MRi Scan? I had mine in Nov and saw surgeon 2 weeks ago .... and on waiting list for surgery for subacrominal impingement and arthritis in both shoulder joints .................... what is doctor doing for you??