gaining weight comes with the territory

so i quit smoking and it will be 1 year come this feb 21st since the last time i inhaled a smoke and dont regret a bit of that itself but i do regret all the bad habits i have gained by quitting you know the things you put in the place of those times where you would normally be smoking i would put food in my mouth ... grrr ... and im starting to show it bigtime now
i tried to go to the gym but i feel like i never have time to go i have to werk in the evening till early morning and i dont wanna do it before work cause ill be worn out for werk and after work im worn out from werk....god ill never loose the weight at this rate....someone help!!!!!!!!!
note to self....loose weight : (