I have a MRI and now i have to get a MRA?

I had my MRI on july 8 and the DR told me that they fond something on or in my brain. he said he didnt want to get in to it that much tell they see what the MRA say. I have siezures. So now i am scared and don't really know how to take it. I am 26 with 4 kids and i want to see them grown up. The Dr did say it has something to do with the blood in my brain. I have no one to talk to and i feel like no one understand how i feel. I am getting my MRA on the 24. does any one know anything about anything like this? My sister thinks i have something wrong with the blood vessels in the brain. thank you!