I feel for you, and yes that is all of our fears.
Could you slow down slow instead of just cutting yourself all off at once?
Let's say, you eating 6 bars of chocolates (or packets of mm's or what not) a day. Can you plan when you will be eating them. Let's say you can cut back to 4. You can have one only after you have had some protein for breakfast, whatever that might be. Let's say you eat a small omelete, and then if you still have room, eat the chocolate, and if you can only get in a bite, then that is all you eat. Then have one after lunch, and eat first some protein then try the chocolate. Then one after diner and one for evening snak?
Slowly start replacing the chocolate with protein, something you really like for protein too (cheese, piece of teryaky chicken, bacon, piece of sausage). Try to avoid carbs like bread, since you are getting plenty of carbs with the candy.
Everytime to crave sweet, have it a rule that you put in some protein in you first, then if you have room you take a bite of chocolate.
I used to be really bad about sweetening my coffee. I was putting 4 or 5 tbs of sugar in my cup. I slowly started cutting back, I now take it black, or with just a bit of skim milk. Didn't happen overnight, but eventually, I got there, and now putting sugar in the coffee is not even appealing, I am ok with no sweet coffee, even tea
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I know is not an easy way out, it took some time getting there just like prior to your surgery, but you have to give it your best shot, you did it once, you can do it again. Stick to this support group for help, even find one you can attend in your town close to you. I work at home so I know how it is, prior to my surgery, I kept some nuts, or snacks by my desk all the time, it was horrifying to see how many calories a serving it had, and how many servings per container, and to see me make it disappear in just a day or two, was quite upsetting.
Hugs, best of luck