babies and seizures!?

i just apent close to 3 hours in the er with my 4 month old after he had a seizure. they basicallt told me he was fine. but i cant tell hes not and will 90% likely be taking him to another hospital after he wakes up from his nap to find out more answers. has anyone ever had this happen? hes never had one before and the hospital literally told me nothing! they drew blood and tried getting urine but didnt run any tests or anything so i dont know if his brain waves are normal or even what type of seizure he experienced. he currently asleep now amd his eyes keep rolling around as if theyre trying to roll back again like they did during his seizure. im just lost as to what is normal and what isn't!