Well, I am only officially sero-neg. RA on my diagnosis code from doc because she needed one right away. We are still in the process of figuring it out.......but.
I have had big toe and knee pain for a few years. Figured osteo in knees and diagnosed hallux rigidux in big toes by foot guy. Got shoe inserts.
Diagnosed with Raynauds in 2013, at age 47. All bloodwork came back neg. Diagnosed primary. Not auto-immune.
Aug. 2017, started having severe hip pain. Left hip worse, but in both. Mostly on left side, shooting down thigh, but also groin on both sides. Toes and feet and knees in general progressively getting worse. Also have what seems like sciatica type pain down left back of leg into foot.
Jan 2018, started elbow pain in both elbows, right worse, shooting down forearm. Couldn't lift my coffee cup at one point.
Feb 2018, Chiropractor diagnosed tennis elbow. Took x-rays of hips, knees and elbows. Said they were normal, except for a tiny bit of narrowing in one knee joint, and 12 degree curve of spine.
Rheum. appt. March 2017. Ultrasound of hip, diagnosed hip bursitis. Got a cort. injection in hip bursa and 3 down I T band. Bloodwork normal, said it is not inflammatory in nature. Ruled out RA. Said I have insomnia (don't EVEN get me started on that ridiculous statement) and prob. age related arthritis (but took no x-rays or did any more ultrasounds) and I feel it more b/c of lack of sleep. (7.5 hours a night)
April 2nd opinion with new rheum. Did a thorough exam this time. And x-rays. Found bone erosions in my feet and hips. Started talking sero-neg. RA .....waiting on more bloodwork, since other doc. only did a few. She has me on a 15 day course of prednisone, to see if I respond to that, as kind of a test. If I respond well to it (and I seem to be) it's another piece of the puzzle, trying to figure things out.
That's where I am now.....I am interested in this thread, too....since I am just starting this journey. But wanted to share my experience. It's frustrating b/c almost everything can be explained away by one doc. after another if they are only looking for the one thing and they don't dig at all. I kept saying, this is not me. Something is wrong. There has to be more here. It has taken awhile to find someone to start to figure it out, but I know it takes others much longer.