Good luck recommitting yourself!
As a 20 year yo-yo dieter who has finally managed to maintain a 70 lb weight loss for nearly 2 years, I would want to offer a little hard-earned advice to this comment you made:
I am starting a new diet tomorrow that has certain things you eat for each meal. Hopefully it will work!
It might work in the short term - but what will be your plan for keeping the weight off for your whole life? Speaking from personal experience, there are few things as heartbreaking as losing weight, buying new clothes, getting all the compliments, feeling GREAT about yourself and then...gaining the weight back.
You have an awesome goal to be a certain size by May - definitely doable. I would just encourage you to change your goal to a certain size...forever. Are you really willing to eat the same foods at every meal for the rest of your life? If not, try to find something you CAN stick to. Permament changes = permanent weight loss.
Good luck during Christmas, it's a tough time for me too