first u have to detect the pain is from detal origin or not.generally rct treated tooth does not pain ,is ur rct treated tooth tender on percussion??? if ,thn think of failure of rct ,u might hav to go for re-rct.
if no pain on percussion thn tak detal x-ray(iopar) see is there any over extent gp or periapical radiolucency. or u might hav other carious tooth what can cause pain
even after through check ur dentist
does nt find any thing thn think for migraine
dental pain geneally doest not go upto the mid of the head but migraine does
there are plenty of different types of migraine
migraine happen due dialatation of extradural blood vessels
commomly prescribed drugs arte sumatriptan
for prophylactic purpose propanolon,methysergide is given
i suggest u to go for flunarizine
(ca chanl blocker) it is quite safe drug u can use.
if symptom reliefs ,thn u definitely hav migraine ,other o.w u have to consult with other dpt
also like eye