I have had a headache for almost 3 months

Have had a MRI, Brain Scan, Caroid Artery Scan, Total Blood workup, Spinal Tap, Sleep Aphena Study. Everything but the sleep study came back normal. I fainted on March 15th, do not know how long I was out, this is the first time I ever passed out, when I woke up I had the headache and it has been with me ever since. I have been to 5 Dr's no one seems to know what is going on. I am a insulin dependent diabetic and have been for 20 years. I am taking 600 mg of Gabapentin 1 AM-1PM, 4MG Zanaflex at nite,25MG Topamax at nite, 50 MG Seroquel at nite.

If anyone has any idea I would sure appreciate it. My pills last for about 3 hours then the headache comes back really bad and it is a long time between pills, I sometimes take 800MG of Ibuprobin in the middle of the day just to be able to navigate. I should tell you I turned 60 on March 13.

Thanks and sorry this is so long

Vicki