headaches

Ok so for the past eight years I have had intermittent headaches. With the start of nursing school (I'm in the end of my junior year of a BSN program) they have been getting worse. I've seen an ENT and he states they are not sinus related, and I've seen a primary care doc and have gotten an MRI and she says that they are stressed induced. The thing is I had them before all the stress of nursing school! They are usually on top of my head (can be both or either side) and can start from my forehead up (if that makes any sense). I have seen eye doctors since I was eight and have been told my headaches are not from vision problems. I also have a neurologist appointment this coming Friday. Anyone have any ideas or comments? I would greatly appreciate them as OTC meds and the few prescriptions I've been on (ultram and amitryptilline) have not helped! It's really hard to concentrate when you have a headache and as it's getting closer to finals, I need to fix it soon. At least until the summer!