Two Key issues for me to quit

Hey all. My name is Jill,Herbal cigarettes, I'm 19 and I have been smoking for 7 years (bad, I know.) I have a quit date set for two weeks from now, but I want to have as much information as possible so that I can actually do it for good this time. I occasionally go weekends without smoking, and although it's not a particularly pleasant experience,stop smoking, I can do it. The major problems for me are that I have panic disorder, and IBS and without smokes, my panic goes into full swing and my stomach goes out of control... If anybody has any first hand experience with any of these problems that can relay some advice to me, I would really appreciate it. Thanks.-Jill