It is extremely important for anyone who has had a seizure to see a doctor. Even people who have not had a big, obvious seizure should see a doctor if they suspect (or people tell them) that there are periods during which they are not aware of what they're doing.
The doctor will try to determine whether a seizure has occurred. If so, was it caused by some medical condition (diabetes, for instance) that may need treatment? Or is the problem epilepsy? If it's epilepsy, more tests may be needed and usually medicines will be prescribed to prevent further seizures.