So who is buying the soda? Stop buying it. You are playing head games with yourself.
This happens. Get back on the horse. One meal at a time, cut the carbs out. It's not that you fell off the wagon, it's that you get back on the wagon. Go get some sugar free popsicles or something to replace the binge sweets. You can do this one meal at a time. After 3 days the cravings will subside once you stop ingesting all those carbs. Add some good fats like avocado, coconut oil to help you feel sarisfied. Up your protein to 100grams.
Get your bariatric materials out and reread them. Journal. Journal your food. Journal your gratitude.