Sounds to me like you're doing great! What's this rocky start you're talking about?
Seriously, half a peanut butter egg is a pretty minor setback. And congrats to you for STOPPING. Great work.
I think the sweet tooth solutions come in two camps. Some people feel that sweets are just a trigger food for them and if they have a little they'll just want more, and therefore draw a very hard line and don't allow themselves any sweets. Other people think that completely depriving themselves will eventually drive them over the deep end and therefore allow themselves portion controlled sweets from time to time. You'll have to decide what works best for you. I guess there's probably a third camp that goes the sugar-free route to get the sweets without the calories.
I'm in the second camp. I like sweets and don't want to tell myself "never." This weekend I had two treats, a cupcake on Saturday, and strawberries with whipped cream on Sunday, which was probably a bit overboard, but I'm not very often in situations where that will happen.