Asecretidentity - just remember that by leaving mid bond you are increasing your debt as you will owe the company the unworked portion, would this be better or worse than continuing as you are?
Don't be swayed by Modderator's 'advice', it is totally wrong and could very well lead you into much more serious trouble with you present employer, who may take you to court thus causing you to incur legal fees as well and trouble with a future employer who won't be too keen to take on a bond breaker - word gets round.
Have you considered going and talking to your management? You may be surprised at how reasonable they can be if you present your circumstances honestly, I suggest you give that a try first.
Best of luck.