I was sleeved on July 12 and felt very much as you do now for the first six weeks. This is a frustrating stage as you feel well externally but internally your system is still healing and adjusting to the change. I cried every day wondering if I was ever going to eat more than two teaspoons of food at a meal or how I was ever going to stay healthy when I couln't get enough fluids and Protein in each day.
Unlike you, I do not have a feeling of hunger so I am eating five very small protein based meals per day. It took me a long time to realize that the pressure in my upper chest after eating was the feeling of fullness. Adjusting to smaller more frequent meals has alleviated that.
Now almost 8 weeks post surgery I have lost 38 pounds and feel fantastic. I am trying new foods each day to see what I can tolerate and am happy that most foods are going down well. I avoid beads, Pasta, rice, potatoes because they are simply too filling and don't leave room for healthier foods.
Hang in there, you will feel better about your decision as you continue to heal. I now realize that this is a journey and each day will present new challenges and accomplishments as you adjust to your new life.