Congrats on making the decision to quit.
The nicotine should be out of your system by now. But, that doesn't mean you are out of the woods yet. The mental battle is just beginning. The first two weeks were pretty rough for me, but by the time I started the fourth week things were getting noticeably better. Everybody is different, but we are all similar.
My advice is to get plenty of exercise, 3 strong meals a day, and drink a lot of water. Seeds, mint snuff, gum or whatever it takes that does not contain nicotine.
Good luck. I promise you it gets better than what you are going through right now. Hang in there. If I can do it after 35 years of chew and cigars, you can do it too. I am on Day 95 today and I feel better than I have felt in years.