Lovtolaff, first off, congratulations on quitting smoking!!! That's fantastic! It's a really, really difficult undertaking, and you did it! Pat yourself on the back, kiddo!
As far as the diet/exercise, well, maybe it was too much to try all at once. One thing at a time, perhaps. Maybe you just need to give your body (and your psyche) time to adjust to the fact that you're now a non-smoker.
I'm not suggesting you have an all-out food-fest, just cut yourself a little slack
. Work on just maintaining your present weight while subtly incorporating little baby-step changes into your eating and exercise habits.
You've accomplished something really BIG here and maybe you just need a little time to make non-smoking part of your identity before jumping full-bore into a weight-loss regimen.
I'm very, very proud of you! And I'm also an ex-smoker (smoke-free for over 20 years now) so I can really appreciate what you've done.