If it helps, I had exactly the same problem.  30 minutes after a meal, no matter how big that meal had been, I'd be guzzling a packet of choccy bics or wolfing down a bowl or two of ice cream.
Within a few weeks of lowering my carbs, reducing meal portion sizes and cutting-out sugar entirely, I'd seen the spikes in my BG come down and the sugar craving stopped and it hasn't come back.
It left without saying goodbye - I suddenly realised one day that I'd stopped needing something sweet but I couldn't work out exactly when it happened.
Hang on in there; it'll come right soon.  In the meantime, try the usual low carb snacks or drink some plain water when you feel hungry - fills you up, no calories and has other health benefits too.