For about 6 mos. I have had headaches that come on as a vice like pressure . . . more on my right side and with tremors sometimes. Migraines are more typical in that 3 day cycle, if that's how yours went. OTC tylenol and motrin did not work, 1/2 a vicoden would only dull the pain. My last headache lasted 12 days but before that it would be 3 days at a time . I was desperate to try anything that might help and did acupuncture. I found out from neuro that I may have a murmur and my blood may not circulate properly. I think there is some truth to acupuncture helping the blood flow, as I have not had any headaches (only slight pressure) since last month.

Other questions to ask might be does your heart race sometimes? You did mention nausea/lt. headed. I have found that climbing stairs now makes me shaky, gets my heart racing a little and in turn makes the pressure return to my head - it didn't used to. So I am hoping in my case that I am closer to finding out what mine is.

I would suggest keeping some sort of symptom tracker for when you go to see a Dr. if they persist. I have also heard that changes in barometric pressure can cause headaches (in fact an NPR report was done recently) - windy, drops or spikes in temp. where you are?