headaches during cardio

i do 50 minutes of cardio every day... in the past two weeks i've started to get a headache in the middle of my cardio workouts. it's usually just a twinge of tightness on the top right side of my head. by the time i'm finished and even hours later it's a full blown tension headache. i am prone to headaches and migranes, but i think this is completely bizzare, and not one of my normal headache triggers. i eat 1200 calories a day (sometimes less) of usually whole foods, and drink about a gallon of water a day, so i don't think it has anything to do with nourishment or hydration... all i can think is that i'm stressing over the workout, worrying if it's effective enough. maybe it's a true tension headache and i'm just not noticing it in my neck first. i do have a stress/tension problem, that tends to get out of control pretty fast.

thoughts/suggestions?

Wed. Apr 25, 11:30pm

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