Passing out on the toilet? seizures?

I had an episode 2 weeks ago where I had diarrhea. I had just sat down on the toilet and did not strain. I was weak, so I rested my head on the back of the toilet. Next thing I know, my husband is screaming my name. I could barely move, I could not push myself to get up. After about 45 seconds of "waking up" I realized that I had bowel incontinence, or loss of bowel control. I told my husband I was fine and asked him to leave because I was so embarrassed. I remember that, but then everything beyond that is a blur. I do not remember the rest of that night, just the next morning waking up with a massive headache and a bruised cheek bone. The doctor said that he does not think it was low blood pressure/straining the muscles because of the bowel incontinence. He said he wanted to me to go to a neurologist and get an MRI to confirm that I got a concussion and to see if what I experienced may have been a seizure. They did an EKG and bloodwork, both came back normal. Could this really be a seizure? I don't know much about them, and now I'm getting worried that something is seriously wrong. Has anyone gone through something like this? Have any ideas? I'm waiting to hear back from my insurance company on which neurologist I can go to.