Really tired, jaw are also in some pain fro grinding. what should you do?

Dentist, stress mgmt: Sounds like you are under some stress and are grinding and clenching your teeth as a result, causing tmd / tmj. Try to control the stress as best as you can or see a primary care doctor for advice, and go to the dentist help with the jaw pain.

Dentist: Should see a dentist and possibly get to source of the grinding or have a custom mouthpiece constructed. If the teeth are worn down, this will change your bite, which in turn can cause muscle and TMJ problems.