I self-diagnosed my shoulder injury after a hard fall. I went on the internet and developed a PT plan for recovery. No MRI, no X-rays, who needs all that?
Oh yeah, I also talked to a bunch of my buddies that had shoulder injuries and got their advice.
Now, more than one year later, I still suffer significant pain and weakness in my shoulder.
You wento to an Orthopedist and have a treatment plan beginning with PT. Follow it.