That is pretty vague.
What did the doctor or PT say was the cause of the injury?
What advice did they give you about preventing the situation from recurring?
Have you watched these?
The 500th Video; Great Sub-Scap Shoulder Smash Drill
Episode 294: Shoulder-What to Fix First, and Wii Mob
Episode 101: Shoulder Relationships–Soft Tissue
Episode 05: Darth Shoulder