Wow, that's a really intense situation! I'm sorry you had to go through that. I saw someone have a seizure once- It wasn't as bad as you describe, they were there one minute and all of a sudden they were hunched over convulsing and stuff... it's kind of hard to get it out of your head for a while I suppose, I got over it really fast. Do you see a therapist? Maybe try and talk to them about it if you do. Try and draw a picture of what happened, or write about it, and then crumple it and rip it into little pieces. This was a technique I came up with to kind of "Destroy" the bad things in life.
Hope this helped... just hang in there, it'll get better soon. Take care!