I certainly understand this, with the way the economy is it can be very difficult to find the job that you want, or just a job in general. I'm sorry you're having to go through this. It's frustrating when your motivation doesn't turn into the results you want.
I have questions for you, though: Are you getting call backs from the companies that you apply to and then an interview, and never hear back from them, or, are you just not hearing anything back when you apply? Do you have a resume?