Seeing a dentist to rule out dental pathology is advised. If there is no identifiable dental pathology, you are probably having non-odontogenous toothache. In that case, you may need to see an Orofacial pain specialist.
Interestingly the toothache disappeared when I started taking blood pressure pills.
Is your pain on the top or bottom arch? Have you had any allergy or sinus trouble? Sometimes sinus pressure and congestion causes radiating tooth pain.