I am sorry you are having issues. There's a couple of things you can do to help you get your Fluid in. Try changing the temp of the liquid. I could only do room temperature or warmer. broth and tea were my saviors. Also, take a shot glass, or something else that is about an ounce, (I was given med cups) and make sure you are trying to drink one every 15 minutes. That's 4 oz an hour. In 16 hours, you will have your 64 oz. It's a job at first to get fluid.. Heck, I still miss my goal on many days. Just make sure you're not already dehydrated.
The "what have I done" thought, most know it well. It will get better. You're still swollen and freshly cut. I am 3 months out and almost forgot about the beginning. Good luck honey. It will get better.