Hi,
First of all there is nothing to be afraid of the dentist as fear do not resolve any of the problems. Consult your dentist and feel free to talk about your problems and plan accordingly.
As for the problem , you need to do a complete dental checkup to find what causes the pain (any cavities, infections etc) which can only be done by a dentist . So fear not and just pay a visit to your nearby dentist and do a checkup as soon before the pain gets any further.
Next Steps
Visit a nearby Dental clinic for a complete dental checkup