I'm a little farther out than you: post-op day 5 here. Remember, you just had MAJOR surgery. (I am a health care provider so I chose to really minimize what I'd had done but it's a big deal.) You had a significant portion of your stomach removed. You and I both feel weak and sick right now and that's REALLY normal. Give yourself a chance to recover. (I'm giving myself a similar pep talk--not so much about hating my decision but about being more realistic about what I just put my body through.)
This too shall pass. Although I am not recommending it after the decision you and I made for ourselves, we can choose to fail the sleeve too. There are people who make unhealthy food choices, stretch out their sleeves and gain. I just tell myself that I have no idea why I would do so after going through the recovery we are now experiencing.
I guess this is more of a stream-of-consciousness response than a pep talk but I just wanted to tell you that you are not alone and this is very temporary. Your job right now (as a very smart colleague told me) is to drink to prevent dehydration, sleep, and poop--in other words, heal!
I hope you hang in there.
Dianne