Translation of "Flashback" in French

I needed to have a flashback.

Et il a fallu que je fasse un flashback.

In a split second, I see a flashback

En un quart de seconde, j'ai un flash

And this flashback brought up the question of doors.

Et, en faisant ce flashback, est arrivée une question de portes.

I smiled to myself as I had a flashback to the conversation that I had with Kenny,

J'ai souri en repensant à la conversation que j'avais eue avec Kenny,