I would recommend visiting an orthopedic doctor if you can. If your GP is indeed factoring in your psych diagnoses to her overall assessment of your observations, then the specialist training (and less generalistic viewpoint) of an orthopedist could make all the difference.
And if an orthopedist says you're fine (though I think it's more than likely you will be able to get a better idea of what is causing the pain), then no harm no foul. Discouraging you from addressing physical concerns is a dangerous game though. I honestly don't much understand the reluctance to perform tests to rule out possibilities where there are genuine concerns, as being "overmedicalizing." That's what tests are for, to confirm or rule out~and just because a given concern may ultimately be ruled out doesn't at all make the test unnecessary. That just makes it good news.
I've had the same trouble only with pdocs. I had one ask me "how" it was that I came to know that I have bone spurs in my neck, when I told him in detail about my spinal condition, which has been developing over decades now and is quite complicated. (My neck, is a wreck.) It's possible that my eyes started doing that sarcastic slow-blink at that point, in a manner that expressed "really?" Obviously the only way one would know about the existence of bone spurs would be from MRIs (and possibly xrays, though I don't recall.. they tend to prefer checking out my crazy set of spinal conditions in all available detail), and as confirmed by highly qualified physicians.
Not that it even mattered that much in the context. I was just explaining I was in a lot of physical pain that day, not trying to get mired down in another of his explorations into questioning my grip on reality. Down another rabbit hole, with no rabbit.
After explaining that indeed the information I was sharing was the result of advice from many fine surgeons and orthopedists over many years and not from my own imagination, I offered to bring in the images if he was interested to see them, and he said that he was. I later reconsidered though, when I realized it would take some effort to track them down in my house, and for what reason did I need to upend my world to locate them? To prove physical reality? He asked me another time "how" I knew my hair was falling out, which I'd told him had sadly become the case ever since my previous neurologist had prescribed me depakote for migraines. To which the answer is a simple preponderance of observable physical evidence; for instance besides the handfuls of it coming out, the fact that only half of it was left anymore. By the time I left therapy with him I was wondering if he would ever have gotten through the unnecessary process of checking to see whether I fabricated truths, so that we could work on my actual problems. (I did eventually ask him this outright, in a non-challenging manner, but he professed ignorance, and I can't work with someone who refuses to at least occasionally pull back a veil which is transparent to me anyway.
Anyhoo. Going forward I suppose I would hope to have the presence of mind right at a time I'm being challenged, to ask "what kind of verification do you need?" ..and then if I feel the request is unreasonable, "why" that level of verification ..and then straight up "what is your assessment of what I've told you?" At best I would hope to make reasonable headway in this manner, and at worst I would expect the questions to at least be an indication of my presence of mind.