I was sleeved on Monday and my one incision hurts like hell too! Today was the first day I was able to meet both my water and protein requirements. Dr has me on clear liquids for the first week. Just keep walking as much as you can and try a bunch of different things to drink, I've had water, propel zero, vitamin water zero, nectar, unjury chicken soup, crystal light and premier protein and pure protein drinks. At one point in time I had 3 different drinks lined up in front of me for variety! It really has gotten better each day. Keep up with the pain meds too. They will help you heal faster.
