Abnormal (epileptiform) EEG but no seizures

Hello. I have an abnormal EEG with bilateral epileptiform spikes. However, I never had a seizure, nor an abscense.

What could be the cause for such abnormal EEG?  I have a normal Nuclear Magnetic Resonance.


more details:   I was misdiagnosed with epilepsy so I took Valcote for 1 year, then I did another EEG and it was normal, and because I actually never had seizures in my life, nor absences, my new neurologists ruled out epilepsy.

One year later I developed a psychotic break.   Now my psychiatrist is saying that the abnormal EEG may be related. Does anyone have any information on this?