I am chasing one client for 2 months now. He didn't pay me. The problem is he is father of one of my best friends, who I know since early childhood. Everytime I call him he postpones our conversation. And this is one of the numerous examples of me chasing clients. I know how you feel, even if its 10$ job, you still feel crappy if you are not payed at the end of the day as negotiated. 2 years of freelancing experience here, I guess I'll quit soon. Good luck!