Charged with DUI but had a seizure.

So I was arrested on my birthday in February 2016 after what I assume to be a seizure. I have had seizures since I was 22 and am now 36. I had been doing well with just having minor issues, but the DMV never suspended my license for at least the last two years. I had an aurora but was unable to totally pull over and ended up pulling over to the wrong side of road and parking. A police officer pulled in behind me as I was getting my self back together. I felt like I was blocking their way so I started to drive again to pull out of their way. I did not know it was police officer because the SUV was so close to me I could see the top of the vehicle. I finally realized it was an police car and I pulled over. When the officer told me what I did, parked on the wrong side of the road, I had no recollection of doing it. They called an ambulance and I did not want to go to the hospital. All I wanted to do was go home. The officer then decided to give me a field sobriety test and I failed and was placed under arrest. I was on my way to work when this was happening so it was 6:30 am. He said I was unsafe to drive. The officer then took me to police station and made me blow. My bac reading was 0.0. So they called a DRE (DRUG RECOGNITION EXPERT) to come in to see if he could find anything. He did a field sobriety test again, had me count to 30 with my eyes close, looking at my pupils in a light room and a dark room and a few other things. He determined I was under the influence of cannabis. I had done it in the past but not recently. It had been three and a half months. I was charged with Driving Under the Influence, careless driving, reckless driving and unsafe lane change. I did hire a lawyer but spending money to hire him, not driving now and going to my doctor to figure what happened has been a real up and down emotional fight with myself. My doctor ended up switching my medication so I'm in the middle of being ween off of oxcarbazepine (Trileptal) put onto keppra. Any experiences, suggestions or advice would be greatly appreciated.