As others have suggested, work with your GP and rhuemologist first. It may be too soon for a PM. Also, most PM's will require that you take a time-release opioid as part of your treatment. That can cost a lot. If you don't have prescription benefits, we're talking $200+ per month for many of them. Moreover, it may be a bad way to start a relationship with a PM if you go in there with undiagnosed rhuemtological issues and dental pain. That's not going to look good at all, especially given your age.
I generally wouldn't recommend credit card debt, but if you have no other options (parents, etc.), maybe take care of your dental needs on a credit card. Depending upon your credit rating, you might be able to find a 0% interest for the first year, or something fairly low. Google "credit card offers" and see what is out there.
Another option to consider is a dental school. I realize that is scary, but you might want to look into it. They can treat patients at far lower costs or even free of charge in some cases. Perhaps also coordinate between one and a professional, to try to balance costs.
Acute dental pain can be overwhelming, but it is fortunately one of the causes of pain that can be most successful resolved. Try to get that out of the way.
C4-T4 Scoliosis (disk degeneration, stenosis, narrowed neuroforamen, bone spurs), RT hip and SI joint damage from car accident. Also, pectus excavatum, supraventricular tacycardia and mitral valve prolapse syndrome.
Current meds: Ultram ER 300mg & 2-3x 10mg Hydrocodone daily. Oxycodone 10mg for BT. .25-.5mg xanax as needed for sleep, Verapamil 240mg SR (for tachycardia). [/gray