I'm not fully medically qualified, but it could simply be an infection in any one or more of your ears, nose or throat. They're all closely connected and a problem with one can cause manifestations of pain or other symptoms in the other areas.
Do you feel like your ears are blocked at all? Have you recently had any kind of head-cold or ear/nose/throat infection? If so, what I'd probably try myself would be a decongestant tablet like Sudafed, just in case there is any kind of congestion. I'd check with a pharmacist first though, just in case it's something different.
If this isn't the case, then you may well have a low-level ear infection which will probably have to be treated by the doctor with antibiotics.
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