HI Amy,
Sorry to hear your not feeling so good.
I am not sure about medical reasons you could be getting headaches but i got them really bad for about 8 weeks during my pregnancy.
I just figured it was due to cutting things out like coffee and caffine in general, they passed at about 20 weeks. All my tests came back normal so I just grinned and beared it with panadine when they got really bad.
Maybe you should go get checked out just in case.. that way you can put your mind at ease too.
Hope you feel better soon.
Good luck
xoxo