it's probably some facet join inflammation because it gets better with NSAID, se a Physiotherapisy
Ummm...it sounds like trigeminal neuralgia to me. If you can't afford to see a doc, that rules out any prescription meds like Imitrex or Lyrica. Physiotherapy won't help: this condition is related to migraine headaches. I know: I have it infrequently (thank God) but it is like someone stabbing a knife in the side of my head and ear. Have you tried plain aspirin?