Can Taking Forecit Be Safe For Migraines?

I have constant migranes and I have seen a doctor and they prescribed me forecit for my head. It is the only thing that gets rid of them. I tried excedrin migrane and it doesn't help. I am also tired and feel exhausted all the time and they have done tests on me for anemia and thyroid problems, and they all came back normal. For my migranes they did a cscan for my head and sinuses and they still cannot find what is wrong. Can you help?