Can one be diagnosed with epilepsy after one seizure in their sleep to later find out they had a wrong diagnosis even though 1 eeg was positive .1 neg?

Common question: Epilepsy is a clinical condition of a risk for recurrent seizures. A single seizure is not epilepsy. Eeg does not diagnose epilepsy. It is a tool used by an experienced neurologist to help with clinical decision making. The diagnosis of epilepsy is a clinical decision based on thorough evaluation of many factors. Some use the concept of increased risk or low seizure threshold.

Maybe: Nocturnal convulsions occur frequently in epilepsy. Convulsions occur secondary to abnormal electrical firing of nerve cells. But epilepsy is a condition where these discharges are initiated spontaneously in the brain. Abnormal eegs reflect abnormal electrical function which may occur with non-epileptic conditions as well as epilepsy. Even known epileptics may have normal eegs. See neurologist.