Facial/jaw/gum pain after cracking my jaw. what is the best treatment?

Dental exam: There may be a couple of dental issues happening here. You should go to a dentist who will give you a full exam including: x-rays, periodontal charting, TMJ screening and oral cancer screening and anything else the dentist feels will help with his diagnosis. Once all of the pieces of the puzzle have been put together a proper diagnosis and treatment plan will be presented to you.

TMJ: Could be temperomandibular joint derrangement from injury or bad bite which results in this complex joint not working smoothly. You need to see a dentist who will take an xray that shows if the joint is abnormal as well as checking if your bite is off.