Let me just interject a little something here to for you new quitters. Think of the "pangs of withdrawal" as cutting your new teeth of freedom. That is to say, it may be unpleasant for the first little while but you are doing two wonderful things in the midst of all this misery you're feeling:
1. You are riding your body of not only nicotine but a lot of other toxins that you have ingested over a long period of time. It's no wonder your body is doing weird things temporarily.
2. Your are having to retrain your brain to function without cigarettes as part of your daily routine. You're currently on autopilot when it comes to lighting up. Stress at work or at home; light one up. Happy event, light one up. Time to relax, light one up. Sad thing happens, light one up. Meal finished, light one up and on, and on it goes. You now have to figure out how to mentally function day to day so you are not addressing all these things and more by pulling out a smoke and lighting it up. That's a lot of reprogramming going on there. No wonder you're jittery and anxious. It's hard work and takes a while to sort it all out and be comfortable with it all.
Try and embrace the fact that you have started down the road a whole new way of functioning. This is the road to freedom that you want so badly. This is what needs to be done to get there and you are finally doing it! Don't fear it so much. Don't dwell on how horrible you feel. You're changing your life for the better and that's a good thing, a happy thing. These feelings of misery won't last that long. Live through them while they're with you because soon you will be in a new healthier world and you'll wonder what the hell all the fuss was about and my God, how could I have smoked like that for so long.
It's not that far off if you just quit and stay quit. No puffs, no cigarettes; just quit!