What to do after interviewing for jobs and waiting for responses?

I am going crazy waiting to hear back if I got a job or not. I don’t want to do work because if I get a job it will be pointless. I don’t want to look for more jobs for the same reason. But I’m not sure I even got the job. What a predicament, right? I can’t function right now and I’ve turned into a complete bum the past few days. How can I motivate myself to do work?
By work I mean school work and my GPA.

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