I have a history of migraines and pseudotumor cerebri, low tension headaches as well as run of the mill tension and barometric induced headaches. The migraines and PTC have not been a problem for a long time. I take tizanidine at night and still abuse caffiene. A couple nights ago out of no-where I suddenly felt like meat cleaver was splitting the center of my brain. I found instant relief by doing valsalva, finally found an imitrex and the headache resolved in about 15 minutes. I am very familiar with different headaches and my concern is why the valsalva worked as well as the imitrex, the two seem to contradict each other. The next day the moment I felt a headache starting I took an imitrex and hydrocodone which aborted the headache, a BMP drawn at the office was normal. I do not appear to have any neurological deficits but I am concerned. I have had numerous MRIs (though none in the last decade), and notice no vision changes. I would be very grateful for any insight. Sincerely, Nancy