I'm new and need some help quickly.

My three year son has had three Tonic-clonic seizures. But yesterday something different happened to him. He was acting normal and he sat down to eat dinner he ate a couple bites and then said I'm tired. He went and laid on the couch with his head facing to the side. He kept saying he wanted to go to sleep. He turned pale, his eyes got glassy, he started breathing faster than normal and he kept sticking his tongue out and up licking his lips. His legs jerked a couple times and then he started to stare looking in one spot. He answered me when I proceeded to ask him a question. So he could respond to me but he kept starring at that one spot not looking at me. Then it was over he got up on his own and started playing and acting normal. He did not have a fever. This whole episode lasted a minute or so. Does anyone know what this was or what type of seizure? I have read so information about seizures but am still not sure. Also his doctors prescribed Tegretol for him to take for teo years. He is suppose to have a EEG done after he starts taking the Tegretol. I just need a second opnion about the medicine. I don't know if I should give it to him or not? I have read about the side effects and they scare me. My brothers daughter has had four Tonic-Clonic seizures but his doctor never prescribed tegretol and she is two. Can anyone give me some advice please?