awwww... Im sorry this keep happening. Believe it or not, I feel your pain. I am lucky enough (I guess) to have a job, but I am looking for a new job... over a year now. I have had a few interviews and I'll go so far as to say that IF I hear back from the company after I hound them every 2 weeks, I don't get the job and I get NO feedback at all. No idea why I didn't get it.
Currently I have been informally told that I got a job, but they are asking for references and do not like the ones I've provided. I can't really give them other ones without jeopardizing my current job, which I can't do for obvious reasons. So its frustrating as well.
hang in there, I really hope that something comes through for you soon!