Hubert, I suggest spending a LOT of time on this site in your early days of quit. It helped me so much. Browse HOF speeches, read Traumagnet's thread, read other long introduction threads, etc. You will glean a lot of wisdom from those that have done this before you.
No matter what you are going through, the hoards here have all done it before. We know what it is like. You aren't gonna die!
Just post roll and stay quit for today. Anyone can quit for a day. Then, tomorrow, wake up and do it again. Wash, rinse, repeat, and you'll be out of the woods in no time.