Hi, Welcome to Health care magic forum.
It appears that you have misunderstood the purpose if the
gastric bypass surgery.
gastric bypass is a surgery for pathological conditions ,it may not be of much use for obesity. Here stomach is bypassed of the
duodenum and intestines. So it empties quick and may feel hungry.
But main thing is what ever you eat is not absorbed completely.
So you must get the result to some extent even after eating full food.
There is another surgery called the tube
gastrectomy, which restricts the food intake and control obesity.
You can keep weight under control, by avoiding fats,fries, junk foods, and oily foods.
Increase your activity by practicing, morning walk,
yoga, gardening, and do any work in front of you.
Minimize the sleeping time ,practice late to bed, and early to rise, avoid day time sleep.
Wishing for a quick and complete recovery. Thank you.