I get jaw pain, James, you can get RA in your jaw,
I know, my sister does also. My point was that more people who present with jaw pain are dx'd with fibromyalgia than with RA, and given the other symptoms both dxs need exploring. I have occasional jaw problems, but it "feels" more like Fibromyalgia than PsA. I'm not quite sure how, but i can distinguish, or at least appear to be able to distinguish symptoms from PsA to symptoms from Fibro. If I feel exhausted one day, I'll "know" which disease is causing that fatigue on the day, very strange feeling, but it's probably entirely psychosomatic.
As it happens, my ANA/SED/CRP/RF was all pretty much normal, with fairly severe arthritis, Tulip. Have you have calcium blood levels checked? You didn't mention it in your last post, and I assume you have - it would be irresponsible of a doctor not too, but I think it's important enough for me to ask again!