That's a tough one, unfortunately it's just something you have to get used to. I actually allow myself diet coke one or two days a week (some people will say it's a no-no, but it's one of my few savory treats).
When I'm craving something sweet, I like Skinny Cow ice cream. Weight Watchers also has an ice cream. For chocolate, I like sugar free pudding. For me, it was really about avoiding the bad cravings, after I knew I could "trust" myself not to reach too far over my calorie limit, I introduced lower calorie treats. I now know that one pudding or ice cream means just that, one.
Good luck, it gets easier