Severe headaches. What can be done?

I have been getting headaches since 2006. I have severe headaches sometimes one sided and sometimes forehead only. Consulted lots of doctors and then I took sebelium for a long time. Headache was ok for a while, it was less. I now get headaches with sometimes vision problems, unable to see clearly or sometimes a flash light from corner of my eyes. I have consulted eye specialists aswell, and all the doctors say that it is migraine. Recently this week I got left side a sharp pain kind of headache. For this I consulted and doctor said it is migraine. I had to take rest for 2 days in a complete dark room because light irritates me and everything around irritates me. I feel better now but still sometimes I get the pain. What can be done ? Please help. Thank you in advance.