You have very good reasons for having the surgery & questions & doubts about progressing are common. It’s surgery. It changes your digestive system. There is a period of healing & recovery.
To be successful for the long term, you will have to make changes to how, what & why you eat & your relationship with food. The months post surgery give you time to work through all of this & certainly therapy, as @SleeverSk suggested, can be very helpful.
The surgery also gives you time to develop better eating habits & routines like being more mindful. Will you forget & take a too big sip or bite or eat too quickly? Yes it will happen but your body soon tells you & you’re usually extra careful after the experience. Often all you’ll experience is just discomfort but occasionally foamies or vomiting.
Complications after surgery aren’t common and many are related to pre existing conditions or predispositions. The risks are lower for bariatric surgeries than many other common surgeries.
I used to control almost all my reflux with dietary choices before surgery (no spicy, fatty or rich food, little carbonation & reduced caffeine) which is why I had sleeve. I still have reflux but it is different & I need meds every day which I didn’t before.
I hate taking tablets & often forget. Multi vitamins always make me nauseous but my bloods are good & I don’t need to take them anymore though some sleevers still do. Just depends on your diet & absorption for us. But it is a necessity after bypass as malabsorption of calories (& therefore nutrients) is how it contributes to your weight loss.
Dumping can occur with bypass (about 40% chance I think) but if you discover you have it it is simply a matter of avoiding fats or sugars as they are the usual culprits. Some even find they can eat small amounts as time passes. You can also have it with a sleeve but it is less common (30%??).
The average weight loss with sleeve & bypass is about the same 65% +/- of the weight you have to lose to put you in a healthier weight range. Some lose more some lose less.
Make a list of your questions to discuss with your surgeon. They’re best placed to answer them in relation to your specific needs, health status/issues & weight loss/gain history. All the best whichever surgery you have.