Hi Keli,
I get headaches like that all the time. I really think it's probably tension - they are so uncomfortable that you are tense while you're dealing with the pain. Try and stop for a minute close your eyes drop your shoulders and let your mouth fall open a bit... lower your chin a little, when u do this do u feel any of the tension fall away? I am constantly tensing my neck and facial muscles without even realizing it and that, I believe, plays a big part in my headaches. I am on Zoloft also... maybe it's the med that causing it for both of us??? Good luck
Liz