First of all, keep in mind that I am unable to diagnose you because I am unable to examine you, this forum is for educational purposes.
These are all very good questions. An EEG (electroencephalogram) is a brain wave test that is looking for abnormal activity. During a normal study (awake and asleep) the lines of the EEG are all wavy (like gently rolling hills) and contain a mixture of alpha, beta, theta and delta activity. This is technical, but the point is that there are a number of different rhythms going on as your brain conducts its buisness. When neurons (the cells that make up your brainwaves) cause seizures, it is because they all fire at once. When the neurons all fire at once this causes a spike on the EEG. This is not the same as a seizure, but indicates that this area of neurons could cause a seizure. You can think of a spike like a spark that may cause a fire, with the fire being analagous to a seizure. When the fire starts (the seizure) it spreads to other areas of the brain and causes dysfunction (loosing time, visual problems, etc). The medications keep the spikes from evolving into a seizure. Often the spikes will continue, but the fire (seizure) never starts. Since you have a known structural abnormality (the scar from your traumatic brain injury (TBI), I would suggest that you will likely need to stay on medication for life. I would recommend that your doctor get an EEG every couple of years and/or if you start having new symptoms. I would also suggest checking a Keppra level if you think you may be having side effects from the medication.
I hope this has been helpful.
http://www.neuro.wustl.edu/epilepsy/pediatric/articleEEG.html
2. The fact that you haven't had any seizures since being on Keppra is good and no doubt the doctor will want you to stay on the medication at least until your EEG's are normal. Stopping the medication without your doctors permission would be very dangerous as abrupt withdrawal will cause seizures (even in a person without any sign of epilepsy).
3. As your epilepsy has resulted from a traumatic brain injury there is a chance that your brain may heal itself over time. However it is probably a better question to ask a neurologist who has seen your scans and EEG's. I would try and be more assertive in asking these questions and if you get nowhere find a new neurologist.
He kept pushing it off on to my migraines, but they're not toally severe I know plenty of people who have worse, I can function w/mine. I've also never had to be treated for them prior to this. Doesn't make sense. I'm worried I was rushed on to medication in the hospital and now I was diagnosed and I don't know what to do, obviously I'm seeing other doctors but I figured that if there is a source for other advice I might as well seek it.
thank you...