I had weight loss surgery 4 years ago and have some specific advice for you. Go back to the bariatric surgeon that did the surgery and ask for a referral for a dietitian with a speciality in bariatric surgery. Follow thise instructions. remember that it is not just something you do but something you keep doing. If it tastes good that does not mean you have to eat it.
Remember that a person does not qualify for WLS unless they are MORBIDLY obese. If you went through the trouble to have the surgery and lost the weight before get back on track and do it again.