Hi there! I was having similar symptoms due to certain light sensitivity. One day my mum showed me a video of a police officer. The lights of the police car were flashing and it triggered something. It felt like someone just attached an energy sucking machine to me, my jaw started to jitter and I lost control of my muscles and get a bad tremour resulting in me slumping momentarily. I could not think what so ever and had to try to tell my mum to take it away by groaning After numerous CT scans, EEGs, MRI's everything came back clear. I was sent for another EEG and this time a small electrical blip was found, although I don't sieze while having an EEG done. The Neurologist put me on anti siezure tablets immediately. This has subsided the light sensitivity, but not completely. I just get a little sleepy and small tremour now if I encounter light sensitivity. I believed I had Neurological issues prior to this as I was having symptoms of daytime sleepiness, chronic fatigue, sleep paralysis and loss of muscle mass at random intervals throughout the day. Be sure to get your GP to refer you to a neurologist and have them do MRI, CT scans and an EEG. Your GP may even be able to setup these scans and then have you referred to a neuro if there are any abnormalities. Good luck!