Dude go to a physical therapist. It’s entirely possible you have a rotator cuff or labrum injury. At the very least they can help you prevent another injury like this in the future.

Shoulder injuries are the #1 problem I see in my line of work. Almost all of them are due to bad shoulder mechanics. Here’s a quick test; push your shoulders all the way forward. Now lift them as high as you can. Push them behind you as much as possible and then pull them down as low as possible. That’s the position your shoulders should naturally rest. Let go and you’ll most likely notice a huge difference from actual resting position. As your shoulder rolls forward it rotates the humerous, which forces your rotator cuff muscles to be impinged or work at a terrible angle. It can also put undue stress on the labrum. The longer your shoulder is in this position the weaker these muscles become and the more prone you are to injury. Nutrition and generally living healthy works wonders on the body, but it can’t solve bad mechanics.