I sorta get this too, but normally for me it's a headache but different than a normal headache. LIke I can feel the pain moving around my head. It's weird and I almost enjoy it sometimes, but usually it just hurts. I think dehydration could be the problem, because i've drank nothing but pop for like a week straight before (i'm pretty sure that actually dehydrates you). I'll try drinkin lots of water next time.