Posted this a few weeks ago because someone elses DH was going through something similar:-
Cut and paste:
Taken from a communication I had with someone I know. These are her words, not mine:-
When I was at this stage of quitting, I became really depressed and would cry at everything. This was spectacularly unlike me. through lots of reading and posts and research i found out that nicotine was a very strong antidepressant. Nobody had told me that!
What I was experiencing was chemical. i was still doing really well in my quit and this was out of my control. Once I knew that, it was easier. the very reason that zyban works for some people is because it works on that part of the brain. It is an antidepressant which has a side effect of you not wanting to smoke.
I used strong St John's wort and 5htp. These can't be taken by everyone. Check out the drug interactions and if on any medication then ask your doctor. The difference they made to me was great and I was myself again.
It doesn't happen to everyone but if you're feeling down at this stage expecially in the winter it's probably chemical, don't give up your quit. you are doing brilliantly. Get out in the day when it's not grey and wet that is and get some sunlight, use st johns wort or 5htp or a light box or anything that makes you feel better!
Doodle again - please try and get him to understand that the anti depressant effect slams some quitters more than others. I, like my friend above, was severely wolloped by it but like her, once I knew what it was, I could handle it and counter it with some AD's for a while until my body settled down.
It's difficult to research and not all smoking cessation nurses etc accept or even know themselves that this happens to some people but not all.