Need some reassuring words and some encouragement!
It looks like you're assuming 2100 calories per day to maintain your current weight. I would bet that isn't correct. In general, it seems that most of us who go for WLS have very effective metabolisms, meaning we need far fewer calories to maintain than does the average person. Even just 1800 calories could be above your maintenance level and cause you to gain.
My suggestion would be to get rid of the crap and the sweets. Don't buy them, don't let them in your house, don't look at them if you can help it.
Also, are you eating enough fat? Eating a ton of protein with very little fat has been known to cause terrible food cravings. Maybe try some full-fat (or low-fat, but definitely not non-fat) greek yogurt or cheese as part of your protein intake.
Good luck, and I hope you make it through this mental slump soon.
The first year after I had RYN , I was always in a frantic mode of omg what if I fail and I need to have food on hand I can eat . Now 13 years later I laugh at myself. I developed a whole new relationship with food. I did make sure I had protein on hand always. Please trust me, it's worth the journey