With history of skull base infection in past, I think that you should consider getting a PET scan to look for any infective focus. If that is ruled out then we are dealing with chronic daily headache which most likely is medication overuse headache
. This condition generally occurs when one is prescribed analgesics for longer time that is more than 15 days a month for 3 or more months. This condition is tenacious and needs a long planned treatment with amitryptiline with avoidance of analgesics.