This is Dr. David
have you tried a course of antibiotics to help kill off an infection which might not be seen?
you might also benefit from use of an antibiotic mouth wash as well to help kill bacteria and decrease bacterial gingivitis symptoms.
your tooth ache could also be due to trigeminal neuralgia pain from your trigeminal nerve
you would need an MRI scan of the brain with contrast to look at the brain and trigeminal nerve.
it might be something other than your teeth.
trigeminal neuralgia can cause pain in your teeth sometimes.
numbness, pain in the area.
numbness in your gums and teeth area.
well, it could be dental issues
maybe it is the inflamed molar which is causing the pain still.
you still need that root filling procedure.
perhaps your pain will get better after that.
you might need pain medications until then.
your dentist can prescribe you pain medications.
I would ask your doctor for some pain medications like with codeine to help decrease the pain.