You have my sympathy, I was originally classed as seronegative thirty years ago, but ten years ago my RA became so bad, I had to give up teaching. Tests at that time showed I was now seropositive.
Even when I was seronegative, I had yearly, then six monthly appointments with a wonderful rheumatologist.
I cannot understand why you have not been referred to a rhuematologist and are not on disease modifying medication.
I have been through them all and am now on weekly biologic injections, Sulfasalazine, Fentanyl and paracetamol for pain relief. By seeing an NHS rheumatologist, you would also have access to OT and Physio.
Your GP is failing you. Can you see a different GP and ask for an NHS referral?
I hope you get help soon, it is such a cruel disease.