I'm sorry you are struggling with this. I think it's fairly common?
And I'm gonna (of course) take the other angle on this one. You had this surgery to give you an opportunity to REFRAME how you deal with food and to learn new behaviors and relationships with food. Right?
You didn't get this surgery just so you could take yet, ANOTHER scenic route, meandering towards weight loss. Did you?
Cuz I know I didn't.
When you feed a craving you do a couple things...the biggest one is you behaviorally hard wire that action into your brain through repetition. That makes it even harder to break. And then actually using the substance like sugar makes it even worse. But also, using sugar free stuff STILL lights up your pleasure center and activates insulin (fat storing hormone). So....
My advice would be to break up with it. Get an action plan together. You are in WLM (weight loss mode right now). You need to be lean, mean, and green! Don't cheat. Eat meat! Right? So when you're hungry behaviorally, do something else. Get busy. Make sure you aren't thirsty. Deep breathe. Do relaxation practices. Change things up. Do a puzzle. Color. Do something that engages you creatively rather than passively. Exercise. Take a walk. Drink water!!! Pound the water down til you can't take another sip. Brush your teeth. Or drink black decaff coffee or decaff black tea unsweetened. NO sweets. Avoid sweets!!! Avoid sweet water, sweet vitamins, fruit, ANYTHING sweet for now.
If you are wanting to eat at night, then consider adding a small mini meal. Make it only protein and a tiny bit of healthy fat. Or do a protein drink (yes, sigh, they're sweet. that's a b***h.) Eat a hard boiled egg. My rule during WLM was if I wanted to eat I got to eat a hard boiled egg, or a tuna pouch in water, or an ounce of turkey lunch meat rolled up, or a light string cheese. And if I didn't want any of those, then it was head hunger, not real hunger. And my rule was: I don't feed head hunger, that's what got me to the Obesity Ball.
Hope this helps. Nip it in the bud.
Once you hit maintenance you can set up a whole new set of rules to work with your pouch!