Migraine Help?

I get Migraines quite a lot, sometimes they last all day. If I stay in a dark room with my eyes closed it feels better, but as soon as I get up it starts all over again. I have tried asprins, exedrin Migraine and a couple others and unless it puts me to sleep they don’t really help. Any suggestions on what I can do, or how to avoid getting them?? I don’t even know what causes them! Thanks for your help fellow Flutherers!