6 Days is HUGE!!! Congrats. But remember, that's just the beginning. The nicotine may be out of your system, but the Nic Bitch is still in your psyche. Triggers are everywhere. You'll notice them months from now...that feeling of "hey, this is the first time I've done this without a lip turd since _____ ." Again, the key to dealing with triggers is your ATTITUDE.
See triggers as reminders of your new FREEDOM...not your past. Take it One Day At A Time. And embrace it...all of it, the good, the bad, the no sleep night sweats, the white-knuckled face splash in the bathroom sink, the constipation...all of it. See it this way...you GET to feel this crappy because you CHOSE to quit. That is heroic as fuck. You are not only saving your own life, but leading all quitters (including me) by your example. If that isn't cause to celebrate, I don't know what is.
YOU GOT THIS, BROTHER!!!