Our expert says:
If you found it so easy to sop smoking ( qwhich is easy ) and to stay stopped ( which is really difficult ) ; congratulations. Maybe Zyban sneakily did something useful, but wasn't needed for as long as some people do.
Anyhow, several effective antidepressants are recognized to produce this hard-to-describe sort of muzzy feeling in the head. Some, being somewhat sedating, can impair concentration ( though of course, so does Depression, usually worse so ).
Now, feeling desperate and suicidal is alarming and requires a personal expert assessment by a specialist psychiatrist, and you should arrange this soon. I would be surprised to hear of such a state as due to Zyban ( which is an antidepressant ) or to its withdrawal. Some people do have ba reations to stopping smoking, but this sounds unduly severe.
After a couple of months, Zyban should not be affecting your mood or chemistry, and should have left your system. Yes, it would be a good idea to see a local psychiatrist for a full assessment, to clarify the full nature of this condition, and how best to deal with it.
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