Sorry to hear that you're having such a disheartening experience, rodriguez.
What kind of job are you looking for? I'd suggest that you ask the Job Centre folk help you put together a really good CV and then you simply start phonebashing and writing letters. Find out who is the best person to write to - and get the correct spelling of their name - and write them a personal letter, keeping it to one page and enclosing your polished CV. Follow it up with a polite phone call asking not if they've got a job for you but seeking feedback on your approach and asking advice. People *love* being asked for advice so it endears you to them.
I really think it takes a lot of self-starter-type initiative. Most of the best jobs are never advertised. And good luck - it's no fun, I'm sure, being out of work, and it's very hard to find jobs, despite remarks in other threads about how no able-bodied person needs to be without work.