Seizures can effect and/or alter changes in consciousness, alertness, awareness, cause confusion, muscle spasms, involuntary muscle/motor movements, and others. This is caused by a sensation which is brought on by electrical disturbances within the brain. There are different types of seizures, as well as varying degree's of severity, causes, types (classification), and symptoms which accompany them. Epilepsy is a more common condition which can cause seizures. With this condition, there is a tendency for the brain to release electrical energy's which thus disrupts the other brain functions. So a seizure is ultimately a "symptom" to some other underlying condition, and there are a multiple of conditions which cause these.
I would suggest that have further testing obtained in order to determine what may have caused the seizure. I would recommend that you communicate your concerns with your primary care physician, as he/she may obtain further testing and/or studies, or refer you to a specialist (neurologist) if need be. They may better test specific in order to diagnose and treat as if necessary.
If you have any further questions or concerns, please do not hesitate to ask.