You know that regardless of the outcome of the interview if you celebrate by going off it or drowning your sorrows it will only result in one outcome which is remorse, self pity, damage to your health and state of mind. Capture this moment of strong will and take it as a sign that something deep in side you is telling you to stop.
If the interview goes well, it will lead you onto better things and if it’s not meant for you, you have to learn from it and something better that’s right for you will come along as long as you keep trying.
The key is to enjoy yourself for who you are you can still laugh and joke with friends and have a good time without booze or substances.
Look back at the last day, how did you cope? Life was better without it.
It takes a few moments of strong will to say no and you may have to keep doing that for a while but the reward from knowing you can do it and the immense benefits are hard to ignore.
Good luck with your interview. You can do it!