I Have Been Experiencing Times Where I Feel Like I

I have been experiencing times where I feel like I am walking in a strobe light, and I call it my "zappy" moments. I actually hear static every other second when I feel I am not present. this will go on until I lay down, and if I lay down, I can pass out instantly. I had an EEg and there was no seizure activity, at that time, and my dr said it could be migranes. I don't get a headache, but I realize that is a side effect and not always the case. He put me on Keppra 250mg 2x daily, but I slept all the time. I took it for a week and a half but had to stop. I didn't have any episodes while on the meds, and are having them again off the meds. Like 2x a week. Suggestions?