I wake up w/ headache. Feels like a hit in back of head. Dizziness @ times. Once, saw light shooting, when asleep, out of my control.
This problem could be as a result of anxiety, depression, low blood pressure among other symptoms. You should go and get that looked at and you can also get more information from; http://www.webmd.com/migraines-headaches/headaches-migraines-vision-vertigo-dizziness?page=2.
It's time to see your physician.