Dear Welcome to HCM We understand your concerns I went through your details. Anxiety disorders are a category of mental disorders characterized by feelings of anxiety and fear, where anxiety is a worry about future events and fear is a reaction to current events. These feelings may cause physical symptoms, such as a racing heart and shakiness. In your case, your stem of anxiety is from quitting your habit. The basic lies at the pleasure point of the brain, where, whenever you smoke, the point gets activated and therefore, the body craves for more. You already know, craving is equivalent to anxiety disorder. You overcame it physically but yet to overcome it mentally. At this instance, you do not need nicotine. you need anti-anxiety drugs like xanax. You should also exercise rigorously, engage in physical and agile games, change your life style so as you are always busy whether physically or mentally, undergo rational emotive therapy and cognitive therapy. If you go ahead with the above methods, you are sure to have good sleep. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute detail possible. Hope this answers your query. Further clarifications are welcome. Good luck. Take care.