anxiety
"I started the medication for smoking and anxiety about 3 weeks ago.  The initial side effects are very intense.  I had an intense headache every day for a week and a half but it did go away.  I also had an uncontrollable head tremor and very intense nightmares, both have gone away as well.   The medication has yet to curb my urge to smoke.  When I get anxiety the physical symptoms are very intense, rapid heart rate and breathing, extreme headache and stomach upset.  On the positive side I no longer feel like I don't want to live my life.   I am going to give the medication the time to take full effect and see how it goes.  If the anxiety symptoms don't improve, I will most likely stop after the full 6 weeks that is recommended."