Son newly diagnosed

My son had his first seizure five days ago. He is a 22 year old college student and my best friend. His EEG showed an abnormality in his left frontal lobe. We have an MRI schedule for tuesday. I am terrified that more seizures will follow.

The sunday before his seizure he was out late and was drinking. Same scenario the following day (Monday). He then had a grand mal Tuesday evening. Is it possible that the combination of alcohol and lack of sleep led to a single event seizure? Has anyone had this experience and then focused on sleeping regularly, eating healthy, no aclohol etc and then had not additional issues? It just seems odd to me that now, at age 22, with no past medical issues, he is having issues.