It could be due to unbalanced occlusion or biting problem. .sometimes excessive clenching or night grinding which is a unconscious habit also leads to such problems. .take a muscle relaxant for 3 days twice daily..exact cause can be found only after a detailed clinical examination. .

Its a good holistic approach, body produces sufficient amount of endorphins to alleviate pain. But if there is persistent pain, its best to rule out associated problem with proper clinical examination by a dentist.

In your case a detailed clinical examination and x rays are required to diagnose. For start warm Salt water rinses of the painful area 3-4 times a day along with a muscle relaxant twice daily might solve your problem If the problem persist beyond 3-4 days after doing the above mentioned , then kindly see a dentist in person.