Plain Old Jim, get to your Doctor and get checked out. Severe Bursitis can often exhibit the same symptoms as a Rotator Cuff injury. Pain in the shoulder at night when you roll over on it, pain when lifting your arm etc could be Bursitis and is treatable with Cortisone and Therapy. Only a Doctor can tell and he needs x-rays and MRI's to know for sure.

Hope it's not the Rotator Cuff as that does immobilize most people for 2-3 months.

Al