Not sure if shoulder tendons are the same, but they may be: was the onset of this pain gradual and ignored and pushed through or immediate? If the former, you may have a tendinosis in the shoulder, assuming this is tendon related. A tendinosis will not generally recover by itself and can easily take months of specific therapy to address.
It goes without saying that unless the doctor is sure you need surgery, you should instead go to physical therapy and your new goal is getting the shoulder better, not "trying to deal with it" while lifting weights, for instance. I'm dealing with knee pain now for a few years and in the last year finally decided that my knee, not trying to deal with it, was the priority, so I cut out all my otherwise planned triathlons I would have done this year and have been diligently addressing it, and to good benefit. Goodluck!
Did he note any slippage or ease of pulling the joint out? Bicep tendon damage is common with a labrum tear as well though so it's plausible.
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