I'm totally with you - it's 2 months til the wedding, just over a month til my dress fitting (which still doesn't do up!!! eek!0

and it's so hard! I still have 10lbs to lose
Have you tried cutting down on carbs, and varying your exercise? for example, doing running for a week, then switching to working on the cross trainer, whilst doing an exercise DVD like 30 day shred on other days? your body gets used to exercise so keep challening yourself and this should help!
Whereabouts are you based?