Biofeedback - when I was young and stupid and would break anything to saddle, including bulls, I got dumped so many times that one doctor compared my skull x-ray to a freeway map of LA.
After years of painkillers, blackouts, and horrible migraines, my mother found a Dr who taught me how to relieve my bloodpressure, which is what was causing my symptoms, with biofeedback. Within six months I felt just fine and 30 years later you would never know that I have actualy fractured my skull three times.
For now, rest, keep the lights low, cold compresses will help on the back of your neck. Try to relax and think about feelign the pulse in your fingers. This will help pull the extra blood from your brain and back to your limbs - where it is supposed to be. When you feel a bit better, research and start mediatating (spelled wrong). It will help get rid of the black outs and headaches.
Accupuncture also does wonders - but for me it was more of a temporary fix. One session of accupuncture would help for like a week. We did it three times a week for a coupel years, but in the end it was the biofeedback that helped me the most.