Devastated

I messed up my cat 23 attempt..2 hours of paper was enough to destroy my year long hardwork..I don't even know what next..I badly need a job..I don't know what jobs can I get after Msc chemistry..I don't want to take another year drop for this unpredictable exam..any suggestions what should I do next ?I feel so helpless..I can't face my parents..they are not at all supportive ..Cat was my only escape