Congratulations on becoming a non-smoker !! It is a fantastic thing you have done, keep it up. The symptoms you describe sound just like anxiety, and will disappear as time goes by. A really good tactic (if it s possible) is to go for a walk or run when this happens. If that is not possible, you may be able to try some stress relievers like slow breathing and relaxation techniques. See the link below. Best of luck and well done. You have just added years of healthy life and fun.