Sinus Medication Solution

Ok, iv been to the doctor a million times… and still no answers… iv been gettin headaches every single day.. and i have this horrible pressure feeling in my head and ears… Like a fullness… I have no other sypmtoms, no runny nose, or sneezing or stuffyness or anything so i really dont think its sinus related.. im having an mri of my brain in the morning… some people say stress but i dont know about that, im on zoloft 50mg, but the doc recently uped me to 100mg to see if it helps with the headaches. that was 5 days ago and still no change.. Does anyone know anything about this, or know anyone who has been through this.. what could it be, im going to lose my mind if i dont get some relief soon!!!