Sorry to hear that.
Many of us have been in your position, at one time or another...
The best advice I ever received (while corny) was.."find your obsession and make it your profession".
20 years ago, I was in your position. I was an Accountant and hated it. I was ok, and was doing pretty well, but it bored me stupid. So I sat down and listed all the things I liked and disliked, eg..
Likes
Change - different challenges every day
Intellectually challenging
People interaction
Creativity
Getting things done
Technology
Dislikes
Numbers

Repetition
Documentation
etc
Try and think what you seriously are passionate about. That you love doing.
Pick an industry / jobs that fills 90% of that void
No finacial baggage - then start researching the industry and target a job(s).
If no experience - no problem, just make it a realistic change.
If you are a true go getter then contact HR directly and keep knocking on the door. Even offer to work for them for free for 1 year, if you live at home.
eg. IT - Google, Advertising - Ogilvy (sp?) - aim high
Your passion and persistence will pay off.
Find a mentor, maybe one of your father or one of your friends parents is very successfull. Ask then for advice.
Keep doing your day job well, but spend your spare time plotting a path for a new future.
For the rest of your career, do one thing a year to make yourself more marketable.
Many of us have changed industries and you have age on your side. (Obviously you can't go from bus conductor to Astronaut in one step, but pick the best company in that industry and research the hell out of it.)
Money and/or happiness will come, and you will be successful. Once you leave a job it is twice as hard to get another. Many people (in this market) are going to ask - why are you leaving a good paying job to work for us for free?? A much better proposition than, you are out of a job and desperate and will work for nothing..
Good luck and aim high !
Fergus.