Oh boy... That is not a happy prognosis. If the bursectomy is not a good idea, that doesn't leave you with a whole lot of options beyond pain management and PT.
When I saw my surgeon last week (and he readily agreed to do what he could to expedite my MRI, btw), he also suggested CBD, but as I think I've mentioned, I didn't find that it helped. Until I get the MRI I'm not at the injection point; that's when I'll have to decide between PRP and cortisone. And you're right about PRP; it's $500 out of my pocket and a complete crapshoot.
However, I've been doing a little research on my own and I'm going to try proteolytic enzymes, which apparently can be effective at reducing inflammation. I ordered them and they're on their way; I will definitely report back on that. To quote a family saying, hope dies last!
And probably just as well you didn't flame your surgeon... You can always write those kind of missives and then not send them, though! Sometimes that helps!
I also want to say that I wouldn't wish this on anyone, so please don't misunderstand me, but it gives me some comfort that there is someone else out there in this world of hurt who understands what I'm going through. So I'm not quite so alone with this. I think maybe it's the same for you.
Wishing you success with the new PT and an end to pain, my friend.