persistent headache & jaw pain
generally arise due to incorrect maxillo-mandibular relation. increased overbite may be a cause.
you din't mentioned since when you are experiencing the pain & whats the condition of your lower front teeth (mandibular central incisors) are they mobile.....if they are mobile then your headaches
& jaw pain are are due to increased overbite...this is because due to constant trauma on the lower incisors by upper incisors leads to it mobility.
your pain could also be due to trauma to nerves in the facial & temporal region because of which you are experiencing these symptoms.
it is advised that you should consult a neurologist
for 2nd opinion.
till then you can take any anti inflammatory drug that might provide you temporarily relive.