What Causes A "mobile" Headache With Eye Aches?

I am fifteen years old and I am female, I weight about 8-9 stone. I have been experiencing headaches everyday for about two months now. They are never in a certain part of my head, they tend to move around but are mostly like a rubber band tightening around my head and a lot of aching behind my eyes. These headaches make me feel very light headed and I get a tunnel like light around my eyes. I went to the doctors and they gave me anti-depressants which did not work so i had to go back, they then gave me pizotifen tablets which don't seem to be working. As well as these headaches, every time I eat i feel like i am going to be sick and i get all hot and shaky, but i don't know if it all links together. Please help me!