Don't be scared! We are all human and have lost and gained weight over time. We also all have strengths and weaknesses, so it is great to see that you can identify your own.
I also have a sweet tooth, but find that when I don't use it for a few days the cravings actually disappear. I'm not sure if this works for others, but might be worth a try if you are willing to give up on sweets. Another idea is to mix healthy with sweet. Instead of grabbing a candy bar, try a banana and peanut butter or even some low fat pudding next time. WebMD's 13 Ways to Fight Sugar Cravings may give you other ideas to think about as far as your sweet intake.
As far as portion control goes, you must know what a healthy portion is! Many people try to control the amount of food that they are eating, but haven't a clue what downsizing truly means. Please check out the WebMD Portion Size Plate Tool to get a pictures and comparisons on healthy food portions. I LOVE THIS TOOL!
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