From my history, please explain the problem I have.

Hi doctor,

I have had migraines all of my life as long as I can remember. A year ago, I suddenly fainted, hit my head on the wall and received a concussion. Right before I fainted, I was feeling like I had to burp and I had lots of saliva in my mouth. My head was hurting and I felt dizzy. Then, I felt nauseous and was gagging like I had to throw up, But, I did not. I ran to the bathroom and the nauseous feeling went away, but I fainted and was passed out for a little over a minute, from what my friend said. Then, I heard them yell my name and I slowly woke up confused. I felt fine afterwards. I went to the doctor the next day and they said I had a concussion syndrome. But, the other symptoms were red flags and so I was referred to a neurologist. After three months of tests, as my magnetic resonance imaging (MRI) came out fine without any tumors or anything of the sort, and had two electroencephalogram (EEGs), he had diagnosed me with one type of potential seizure activity while asleep and another type in another area while awake. My first question is, is that possible? Also, the medicines prescribed earlier for migraine did no good for my daily pounding headaches, dizziness and faint spells. I only had two to three other episodes after that where I would randomly faint. Those were around 5 and 7 months ago. My new neurologist based on the other neurologist's diagnosis, prescribed Keppra (extended release) 750 mg and advised to take it daily. After three months, I need to have another EEG. What is my actual problem?