my mom has had seizures since i was born and they sound nothing like what you are having she like blanks out doesnt know whats going on cant talk somtimes falls over or pees hers pants.(she doesnt have grand mal) Yours might be a less harmfull seizure or your like beging to get them. i would go to the docter RIGHT AWAY its not life threating but there are cures and thing you can do to help prevent them so i would check it out
I have epilepsy actually, a disorder in which the person who has it experiences seizures. Have you ever blacked out after the flashes, or thought you had fallen asleep? If so, then you probably had a grand mal seizure. Either way, I would go to the doctor and ask for an EEG (Electroencephalogram, monitors your brain waves and can tell if they're abnormal - and if you have epilepsy). If you can't get it at your hospital/clinic, get a referral to a neurologist. They always have the equipment to get it done. If you don't have insurance, find your local social services place and ask about something called "HealthShare." It greatly minimizes (sometimes even eliminates) the cost of being seen by a doctor, and can help with medication.
Good luck!