Why does my appetite fluctuate

I am a little over 3 months post-op., open RNY. 60 pounds down. My question is why does my appetite go up and down like a yo-yo? One day I can barely force down a protein drink and my water, and then the next day I can eat like a lion. The same amount of food that on one day causes me to feel stuffed, on another day doesn't even begin to fill me up. Example: the several days ago, I had a protein shake for breakfast, and 1/2 cup of cottage cheese in the evening, which I forced down. A couple of days later, throughout the day, I had half a banana, a chicken tostada(small), half an English muffin w/cheese and pepperoni, a double cheeseburger without the bun, and 1/4 of a cup of trail mix(raw nuts, dried fruit, chopped up protein bars). Why does my appetite go up and down, and will this be a permanent thing or will it even out over time? Oh, I forgot to mention--on the days when my appetite is small, I dump easier, and must eat more slowly or I will have pain. On the days when I am very hungry, I can eat faster and never have any dumping. Thanks in advance for your answers.

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