Why can I only eat 7 ounces of cottage cheese, but an entire big mac or 6 inch Sub

I know already that I "shouldn't" be eating a Big Mac or pushing my limits on how much I can eat. I also know that I usually drink with my meals and that makes it wash out faster. However, my concern is more about our mental and emotional weight issues. I did the cottage cheese test this morning for the first time (3 years post op) and I could only eat 7 ounces. However, Friday I had a staff training all day and they brought in Subway sandwiches. I was able to eat a 6 inch Sub with meat, cheese, veggies, and mayo AND a bag of chips. I also drank a Dr. Pepper. I still wasn't really "full". I could have eaten another half sandwich probably. I understand that drinking with the meal can make you hungry sooner because it washes the food out faster. Why am I able to eat more of some foods or when I am drinking though? Is it just that it tastes so good I am overeating? I don't know if I can even really feel when I am satisfied. I am either able to eat or full to the point of throwing up. I really can't distinguish much between there. I had lost over 100 lbs in the first year and was following a low carb, high protein diet and exercising every morning. I honestly don't think I can maintain that for life and when I started eating carbs and continued to drink with meals I gained a little over 50 lbs back. Some of this was caused by an anti-depressant, but I have been off the medicine for over a month now and still have the cravings and appetite. HELP! What is real hunger and what is in my mind? Does anyone else have this problem or am I the only one?

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