Not sure if it's related but I sublaxed my shoulder many many times.
TWICE as bad as a dislocation with extreme sickening pain but luckily went back in on it's own, and didn't require reduction.
As my right shoulder is unfortunally got multidirectional instability.
Could be related as I fractured my collar bone and shoulder blade when it happened.
I wore a special sling for first few weeks and took strong painkillers and iced it.
Then bought a special shoulder brace to stop my arm moving in certain positions.
Behind my back or over my head are the WORST positions and the shoulder can clunk out of it's socket in those positions.
Now 5 months later it's much weaker than my left shoulder and can't lift anything too heavy with my right arm. But no inflammation anymore. Some mild aching and stiffness in the joint if I make certain movements though.
And I'm seeing a physotherapist for excersises, but hasn't done that big of an improvement yet....
Oh and stay away from sports UNTIL it's healed.
The brace I use:
EVS SB03: really supports the shoulder,collar bone,shoulder blades and upper arm. And was about £45.
And has X strap to restrict movement.
I don't wear it much snymore, just if I have to lift heavy things or outstretch my arm or hold it up to do things,