56 year old nothing has scared me like this seizure.

Hi All... I am a 56 year old single woman. Six days ago while walking my dogs I experienced a seizure. I was unconscious for a while, when I came to I was looking up at 2 firemen and 2 EMT's who were working on me. I had no memory of who I was or where I was, but by the time they were putting me in the ambulance I started to recall. This is the first time I ever had a seizure and I am petrified! They did XRays and CT scans (with and without contrast) at the hospital and the only thing they found was that my Potassium was low so they gave me a couple pills to take. After returning home I was SO SORE I couldn't get out of bed for 5 days, and my mind is still a little fuzzy. I go to see the Neurologist in 2 days, and they told me he will likely order MRI and EEG. I am not allowed to take a bath or drive a car. Ironically I am already taking a couple medications that are prescribed for seizures. I am a Cancer survivor and suffer from other medical problems, but nothing has scared me like this seizure has. I am so afraid of having another seizure or even dying. I am afraid that the Dr. will not find out what caused this. Any information anyone can provide would be greatly appreciated! Many thanks!!!