That is also to some extent an artefact of misogyny in medical care - women are held to a higher burden of proof for autoimmune, connective tissue diseases and associated injuries than men; it's only when I have repeated the 45 years of treatment for both, quoting medications, consultants and managed to get staff to actually look at my records that they shut the fuck up about fucking Fibro, as it's the default assumption (other than perimenopause) for a female describing pain - and there's no treatment other than 'live with it'. Unlike Autoimmune and Connective Tissues, where there are many medications and treatments that can help and even cause complete remission. And (ETA) uncontrolled inflammation also affects mood entirely independently of being as a response to pain or trauma/unhappiness - an informal diagnostic of that is where a steroid injection can resolve low mood and lability in a couple of hours. But you'd need to be able to access the hospital for a doctor or prescribing nurse specialist to find that one out.
I still get poked in the classic trigger points for Fibro pain first. I think the intention behind it (especially as it's often very aggressive poking) is to elicit a yelp of pain/surprise so they can immediately dismiss everything as the one diagnosis that has no particular treatment. However, because I'm expecting it, the conversation usually goes along the lines of
'Does that hurt?'
Not particularly because you're digging into a Fibro point. You need to go up to the hot and swollen bit where the ... tendon inserts into .... to find where it hurts'.
'What makes you think you've got anything wrong with you?'
45 years of DMARDs, Physio, Biologics, steroid pulses, significantly raised CRP and ESR, findings on X ray, ultrasound and MRI tend to contribute. And I do generally believe what Consultant Rheumatologists tell me. My current one is x at y hospital - perhaps they'd be happy to explain to you why they think I do?
(Yes, I know I'm being a dick to them at that point. But they're being a dick to me and deliberately inflicting pain with the intention of dismissing everything as the No Treatment Possible Fibro bucket at that point, so they've earned it).