Is Brain Damage Reversable?? Will I Get Better???

I've had headaches and migraines since I was very young. I am now 30. All sorts of tests have been ran and nothing has ever been found until now. In june I had a small seizure (non convulsive) 2 abnormal eeg's later and the diagnosis of epilepsy has been reached. At first I was told that more than likely, due to the fact of no trauma, I was more than likely born with epilepsy. And the seizures have been in the form of headaches and migraines and other things that may have seemed normal to me but were actually seizures. But I never would have known the difference, since i've experienced these almost my entire life.
Now things are getting worse. My symptoms are worsening. I can actually feel my iq dropping. It is getting more difficult for me to read and write and pronounce words that has never been a problem for me before.
Now, my neurologist is telling me that maybe instead of me being born with epilepsy, that it's just the oposite. That my headaches have been benign. That from having such severe migraines and headaches my whole life, they have caused brain damage. And slowly I am getting dumber. I have not been tested for this yet. I am having an mri done tomorrow to check for a brain tumor of some sort. And then he'll send me to a neuropsychologist to assess my brain damage. No one except the people really close to me can tell how dumb i'm getting. Opposed to it taking me close to 7 minutes to type this, it's taken me close to 25. I've had to sound out most of the words and correct most of the spelling. My memory is shot and I can't do more than one task at a time. I could go on, but I won't. Is this reversable? If there is no tumor...If it's only brain damage caused from benign headaches that has caused epilepsy and brain damage, is the damage reversable?
Is brain damage reversable??????????????????????