So I'm about to go on a job interview, but I'm having a breakdown, suggestions?

I have a job interview today for my dream job. The unfortunate part is I have to drive 3 hours to get to it, and its in the town of the girl that just broke my heart a few weeks ago. I’m in a bit of an early/mid life crisis and having a total melt down to the point where I go home and cry at lunch so I can get through the rest of the work day without losing it.

Does anyone have any suggestions for keeping my shit together during this interview? I’ve been trying to focus on it all day, but all the crap in my life keeps jumping up and taking over.