Why Now?

That's what I've been asking myself today, why today?  Why this week?   Why now?  Why at all, really.  Why at the end of a week that has left me exhausted, drained and weak in every way possible did God allow this to happen too?  Why did he take away the one good thing I had, and then let me be torn apart to my core?

I have an interview for a job I desperately want and had thought I would be great for in 14 hours. But after today I honestly can't think of a single reason why they should hire me.  I can't even say I believe I'm a great teacher, or even a very good one.  If they were to ask me the typical interview questions "Why should we hire you?", I wouldn't have an answer.  All I can think of or hear in my mind is that I'm a failure, I'm a mediocre teacher at best, etc. etc.  

Why?  That's all I want to know.  God, why?  The person who tore my heart out today, why?  Why?