At the very least, you should have a dentist check the tooth you mention. The sensitivity you feel may be an initial sign of a small problem, which may only get worse as time passes. It may be a very simple problem, such as root sensitivity to the electric toothbrush, which may be resolved by using toothpaste for sensitive teeth. In either case, having it checked now will be easier than having it checked later. Allison, let me emphasize that I do understand your fear.
Fear is normal and it can be controlled.
I have quite a number of very nervous and anxious patients, but through good communication and by taking treatment slow and easy, many of them are more comfortable now. You do sound mature, so I know you will do the best thing for your health. Let me know if I can be of further assistance. Watch this if baby's meals end with thrown food. Learn about a potentially lifesaving new vaccine.