Hi Kkiyan ~
As Erin mentions, any time you experience a new symptom the best person to discuss it with is your doctor - as he or she has the best understanding of your overall medical situation. Dry mouth can sometimes be a symptom of Sjögren’s syndrome which is another autoimmune condition that sometimes occurs with RA.
You can read more about it here: https://rheumatoidarthritis.net/medical-conditions-occurring-along-with-ra/secondary-sjogrens-syndrome/
If you have been diagnosed with RA, getting in to start treatment with your rheumatologist is key to getting your symptoms under control. You may want to call back and see if they will offer you a sooner appointment or if they would be willing to put you on a cancellation list in case one comes up. I know it is easier said than done when you aren't feeling that well, but often you really do need to advocate for yourself to get the care you need. As they say - it's the squeaky wheel that often gets the grease!
In the meantime, please remember that we are here to support you!
~Mariah~ (Site Moderator)