Migraines, dizzy/light headed with blackouts and nose bleeds.

Hi everyone. Im 19 at the moment and was wondering if anyone might be able to help me figure out a condition that I have been living with for some time now.

Ever since I was 10 I've been getting migraines. However thats not the thing that scares me. I started getting dizzy, light headed and having black outs since the age of 15. My heart races at times when im standing or moving during these episodes. I would have nose bleeds every one and a while when everything else was going on.

These episodes lasts as long as a few hours to a few days depending on how bad it is. I get really dizzy and light-headed when I'm on my feet for any extended amount of time. It feels like I need to catch my breath. The lights get brighter and every sound around me gets louder.

The migraine pain is anywhere from a 5-10, 5 being painful but sensitive to light and sound, 10 being any sound makes my head pound and feels like my eyes are being pushed out from the inside. I can't function when I have that bad of a migraine. I have headaches every few days, always mild but almost constant. I also have trouble sleeping and toss and turn a lot. I also get a lot of nightmares, almost every night. These episodes dont happen often, once a year and usually around winter when I get sick. Any help would be very appriciated.