Anyone familiar with seizures in children non fever/epilepsy related?

My one year old son suffered two seizures on Sun (March 29) with no temperature. He had been throwing up for a couple of days and continued to be sick for a few days after. He had another seizure on Thurs (April 2). He was taken to the ER both times and had a CT Scan, lumbar puncture, blood test for rota-virus, xrays, and an EEG… all tests were Normal. He was not dehydrated and his sodium.Sugar levels were normal

The doctors diagnosed him with Gastroenteritis provoked seizures and say it probably wouldn't happen again. Anyone have any experience with this? Words of encouragement? Did your child have seizures again? I find it so hard to believe that throwing up/diarrhea could cause three seizures… he is normally such a healthy child but at the same time he was sent to a neurologist and that is what they said…