Bella - Can't imagine how you must be feeling mate, having to wait all that time and then get the flick - it's horrible news and I really feel for you. I would be feeling bitter too, but make sure you keep focused on the task and start applying to other airlines right away.
You definetley DON'T have to wait 6 months to apply for the regional airlines of QF, they are run as seperate businesses so keep your chin up and start applying to the rest.
Good Luck, Keep smiling and keep us updated with your progress
Regards
CB