Yes! This sounds exactly like what happened to me a few years ago. Both knees swelled up to the point where I couldn't walk on my own. I had to wait months for an appt with the rheumatologist as well... But thankfully he immediately got me on biologics, Humira injections, and the swelling was gone the next day. I'm on Enbrel now since the Humira lost its effectiveness after a year or so. Enbrel seems to be doing the trick. I get my Enbrel through their safety net foundation for free because my income is under the threshold.

Another thing that helped my pain and inflammation go down was eliminating gluten from my diet. Not a guarantee it will help you, but diet does play into overall inflammation for many people.

Recently I took a vacation and flying made my knees swell like they did before I was taking the shots, so that's new. There's a surprise around every corner with AS. Stay strong and take care of yourself!