Infant spasms

My baby girl is 9 days old and had a spasms attack this morning. I taken her to the doctor and they said she was perfectly normal without running any test. I am scared because I read that seizures can cause brain damage. Anyone else newborn had a spasms attack just once? My baby only had one episode, should I just wait until she have another one? Then be worried? 
Example of the spasms: her arms and legs was stretch out and lock. She was shaking hard and vomiting a little. She stop as soon as