Johnny I am say way. I always feared seizures. My aunt has abscent seizures and my cousin has full blown seizures. I lost a cat to a seizure. I watched her and it was horrible. Seizures do not kill, but they did for my cat but I believe it was from too much medicine. Vet wasn't sure. But they do not kill humans. But it still a fear I have.
The de ja vu thing is just another anxiety symptom. I have had that type of feeling without ever having anxiety and i never got freaked out. This was when I wasnt such a hypochondria like I am now. Of I felt that feeling now, I'm sure I would get freaked out! Lol.