Hi Shelly90, I am newly diagnosed myself. Maybe I am not the correct person to answer this question. Here's some reasons I can think of when it's a good time to get a new rheumatologist.
1. If the rheumatologist makes you feel uncomfortable or belittles your symptoms.
2. If your rheumatologist does not actively listen to you Shelly. Only we know the pain we are feeling.
3. If you feel uncomfortable with the way your treatment is being handled.
4. If when your having bad flare ups or concerns to address with your doctor and he or she never gets back to you.
Hopes this helps!
RS