Re: left side temporal slowing

Focal slowing, where the frequency of the waves in one area of the brain is slower than the frequency in the rest of the brain, has more than one cause, so you're going to have to get your doctor's diagnosis to know exactly what it means to you. Sometimes focal slowing is associated with epilepsy (as it is in my case), but sometimes it can be other things, even other things that also impair conciousness. 

Here's a really informative article on EEG abnormalities and possible causes.

Hopefully your clinical symptoms, EEG, and other data will allow your doc to make a diagnosis and figure out a plan for you.

Best of luck!