Hi Mark,
Welcome to the forum! I've had epilepsy for 38 yrs. I began at the age of 10 yrs. old and I started to have seizures on the right temporal lobe. I would have absence (petit mal) seizures and then 2 yrs. later I started to have complex partial seizures. The neuro couldn't figure out what was causing my seizures and I would often cry for no reason and they thought I was faking the seizures at first. All this happened back in the early 1970's before they had video e.e.g.'s It wasn't until they did a veeg that they found I had lesions on the right temporal lobe of my brain which was triggering seizures and it would make me cry, lose my temper, and be very emotional. After seeing a neuropsychologist, Epileptologist and neurosurgeon to have brain surgery I found out that many people with Right temporal lobe epilepsy can become very emotional. After I had brain surgery done to help reduce my seizures in 1994 things went so much better for me and they found brain damage on both the right and left temporal lobe that can cause the problems your son has had.
You mentioned that light bothered your son this means your son could be photosensitive meaning certain color lights could trigger a seizure. I had a special type of e.e.g. done where they would flash different color strobe lights one at a time and they found that florscent green, amber and bright white were the colors that would trigger seizures for me. Depression is all part of epilepsy and often people feel suicidial do to their epilepsy medications they take. I've found taking vitamin B12 one of the best things to reduce the seizures. Also tell your son to stay away from anything with nutra sweet in it like diet soda and stay away from cell phones. Both nutra sweet and cell phones cause to much electrical activity in the brain and it can trigger seizures. cell phones also can cause brain tumors and shrink the hippocampus (memory) of the brain causing short term memory loss.
I wish you and your son only the best of luck. May God Bless You and Your Family!

Sue