No matter WHAT, don't give up a healthy lifestyle, no matter what weight loss plan you're following.
The great thing about weight loss plans is that even if you fall off, the plan will STILL welcome you back with open, loving arms, and will help take the weight off.
If you haven't been following your plan, just get back into the swing of things. I know it's hard. I've had to do it quite a few times, but it can be done with enough determination.
So you didn't make your current goal. As a friend of mine says: "AFW?" Which means "And freekin' what?" Set a new goal, and when you set it, DON'T put a time frame on it. Time frames are SUCH bad ideas. Not only because if you don't hit the goal within the time frame you get discouraged and/or punish yourself, but because at the beginning, you think "I've got TONS of time!!!" or "I'll never do this! There's not enough time!"
It doesn't matter how long it takes to come off. You're doing this to be healthy. Not just to lose weight.
You CAN do it. You really can. I ain't Superman, so if I can, believe me, ANYBODY can!