Your workout is accidentally strengthening muscles that pull it out more than the ones that hold it in. Otherwise, make that your jab/hook side and don't dive in for doubles and get stuffed, then hang on to it despite being on your face with both arms over your head. Be smart.

Maybe ask in the health section?

Strapping it might work ...

You should baby it with ice.

This has become troublesome. Everytime i fight someone this happens and its a pain in the ***. Im a strong guy with muscles and getting hit doesnt really phase me, so that works to my advantage, but the shoulder stops me every time. Advice from anyone who knows what they are talking about please.