Possible rotator cuff operation needed or just physical therapy?

Back in December, I noticed severe pain in my upper arm/ shoulder region. An ultra sound revealed 4 lipo deposits ranging in size from 10 to 26 centimeters. I had them removed and they turned out benign. However, the pain still persists. The general practitioner who originally sent me to the ultra sound and later referred the operation, said that after looking at the ultra sound, I must have tendonitis and should see a physical therapist. I am wondering if it is a problem with rotator cuff 4 muscles in shoulder causing the problem. What are the chances I might need another operation? I lifted weights, am age 61 and wonder if the weight lifting caused the problem..thanks for your help.