It's interesting, I had MASSIVE fears of pre-op dieting, but I am 5 days in to it and I'm OK. I was very emotional about the idea of no longer having the option of having the food I enjoy be an option for entertainment- we are likely here because we all can relate to food being an emotional outlet, or a constant self reward we give ourselves. The day I started me pre-op diet I realized "wow, this is it- from here on out I am going to be eating less and less, and I won't have the option to eat things for fun". Obviously, once I am healed and back on solid foods, I have my options- but I will never have a lifestyle where I pig out or stuff myself with food by myself or friends.
It's actually been do-able. I find the pre-op diet has set me in to a mode where I realize I HAVE to eat like this in order to have a safe surgery, it's no longer just about weight.
It's tough when hunger kicks in, but you truly can avoid being hungry with the sugar-free Jello until it's time for your next Protein shake "meal".
Also, try glucomannan- it's (in my opinion) the best Fiber to keep you full without giving you stomach ache or resulting in urgent bathroom use.
I also give myself variety with the things I AM allowed- lots of different types of tea, pre-made Jello in different flavors, sugar-free hard candy to suck on, gum, and sugar-free merenge (sp?) Cookies (all egg white, only 10 calories each!).
I also distract myself by staying busy, reading this forum, and checking out the web for clothes I plan to one day fit in to.