You take a deep breath you tell yourself you're not the first or only person to lose a job. I'm not saying that to make you feel like it doesn't matter/it's not a big deal because it is devastating and stressful to lose a job...but people have gotten through this before and you can too.
I assume you got some kind of severance package? You can also file for unemployment the time being.
In the mean time look at this as a new chance. Is there another job you've always wanted to do? Is there something you have experience in that maybe you didn't utilize at your old job?
I see you already have an interview. Clearly you're an employee people want. I'm sure you have special skills and things you can offer them. But to do that you need to stay clean/sober in order to be the best possible version of yourself.
I wish you the best of luck. I am sure you WILL find something