Pre Op Diet!?

So my sugary is scheduled in 2 weeks and I started my pre op diet a few days early. Just to get the feel of things. And oh my god! The hunger is insane! So I find myself eating what was on the list my dietitian gave to me, just in bigger portions. Ex I could have 15 grapes and a cheese stick but I had duble that with some almonds. Still having no sugar and still drinking the protein shakes. But I'm finding it difficult to cut my calories to the extreme the doet calls for. Ive been eating the sugar free jello and having the broth too but it doesn't help much calming my hunger pains. And yes! I know! This is what its going to be like after surgery but after surgery my stomach isn't going to be yelling at me so much. Idk... any thoughts?