I know all doctors are different, but mine didn't require any pre-liquid diet, only the day before. However, I heard some doctors giving out month long liquid diets before surgery. D:
I chose to do a week of liquids before my surgery (for my own peace of mind and to prepare myself) which is tomorrow, and I know how you feel. What helped me, was switching it up and doing my own little recipes - I'd combine red and green jello or chicken broth with tomato soup. Weird, I know, but I've a low expectation for food (I think TV dinners are amazing lol).
Maybe this will help? :3