Hi EsojLabina.
The liver shrinking diet is hard, no doubt about that! I don't think anyone breezes through it without at least a few days of wishing the weeks away. Try distracting yourself - do some DIY, engage in a hobby, go for walks - anything to take your mind off food.
Do you mean you're thinking you won't be able to eat like before? Because that is actually true. The upside is your body won't want to eat like before post-bypass, and that's the biggest tool to help change your mindset around food. But honestly, changing your mindset about food needs to begin pre-surgery, and if you have a complex relationship with food like binge-eating disorder or emotional eating, then you really need to see a bariatric psychologist to get on top of that, or the issues will follow you post surgery, and can manifest as depression.