Migraine

I have suffered with migraines for years. Within the past 10-15 years they have worsened. It seems that I have different levels of severity and am never sure how bad they may get. Yesterday was one of those bad days. The migraine grew more severe as the day wore on. I ended up in bed from 3:30 PM, pretty much until the following morning. They seem to get to a point where there is nothing I can do to feel better and then bed is the only relief I can find. I would love to find the answers to what may be causing them.