Having so much trouble with the smoking

I have been trying to quit, and did for a few days, then fell of the smoking wagon.  It is extremely difficult, because smoking is something I do when I have migraines or FMS pain, as a distraction, too allieve the fustration of pain, pain that is not going away.  I know it needs to be done, but when I am already so unhealthy, I always never cared that I was doing something that was unhealthy... but now it is a specific problem with smoking.  But I just cannot do it, I can do it a little, but not all the way.  It is driving me nuts. 

Plus I got a promotion, thown into the role unprepared, and expected to just do it, when I do not have the full grasp of the subject matter yet.  And this is stressful, it is causing more migraine and aches and pains and stress.  Which makes me what a smoke to calm myself down.