My dad knows a woman who has migraines that often, and they get so bad that she's on disability for it. She's been to the ER with them multiple times, so it is possible it's nothing more.
The headaches could be from tension, though, yea. I usually get a headache the day after I stay on the computer or watch TV too late- doing so with tired or dry eyes. I've been through a phase where I was having headaches constantly but it passed. Don't know what caused it. Are your shoulders tense a lot, pushing upward? That also gives me headaches.