I just had my surgery 1/14/19 and I have the same feelings! Surgery went smooth, I was up and walking right away, able to drink water and protein drinks without any problem, can eat 8 oz of soup with no issue. So then I started second guessing - "Did I make the right choice? What if I don't lose any weight and I have done this to my body? Why am I able to drink and take in protein and other liquids with no problems at such large amounts 3-4 days out from surgery?" .... I keep telling myself to trust the process and not to worry but it is hard!