Liver reduction diet

Hi everyone sorry this is my first post I’m a bit shy. I’m in the uk and due to have my surgery on the 20th of march. I’ve been in my LRD since February 7th. I’m on the milk and yogurt diet and I’m struggling really bad. To the point where I’m not eating at all because the yogurts are making me sick. I just don’t know what to do. I was advised by my surgeon that I needed to do 42 days LRD this is so hard for me. Would they still be able to do the surgery? I’m just at crossroads right now x