What Causes Persistent Migraines And Pressure In Brain?

Hello, I am 21 years old and for about the past 3 months I have been suffering from severe migraines, having them up to 7 days in a row (I have had headaches my whole life, but they have gotten significantly worse). I saw my GP and he prescribed me Midrin. I have been exhausted lately, which I know CAN be a side effect of the Rx, but I have also noticed that I am bruising fairly easily given I have never been one to get bruises. I also occasionally feel like pressure on my brain. I am just wondering if I should be concerned. Thanks for your help.