I have noticed my blood pressure up around 130/80 when I have a migraine. I know that's not high, but usually i'm around 120/70 or lower. But, I think a lot of the times, i get these nasty headeaches from lifting hard. shoulder/delts/shrugs heavy weights bring them on sometimes. I usually can differentiate between the two just by taking a light muscle relaxor like soma - surprisingly, the headache leaves.. ;p