I am a neurophysician
Please understand that the cause of headache could be so many, like migrain, cluster headache
, brain infection, braion tumor, problem in the blood vessels of the brain. A normal MRI rules out brain tumor
, problem of blood vessels in your brain and that is quite good for you in the sense that you donot have any major serious cause of headache. The other possibility , based upon the data you have prvided, i was thinking is that of tension headache
. If your ENT specialist
has ruled out any sinus infection
, which can cause headache, i think you will benefit from a cours of amitryptiline. You can start this medicine as 10 mg to start with for 3 days then 25 mg for 3 days and then 50 mg for 6 months.
Hope this will help you