Consider getting a second opinion if it feels like your rheumatologist is not addressing your concerns. I was 35 when reactive arthritis hit me and was weak enough that I had to crawl to a chair to stand up; I started exercise after the RA went into remission, but strengthening and stretching would have helped me. Even with the fatigue, using exercise bands helps mobility. Here is a link on Mayo Clinic depts that treat RA, but perhaps others on this forum can give you info closer to your home. https://www.mayoclinic.org/diseases-conditions/reactive-arthritis/doctors-departments/ddc-20354844