I'm on day 5 of my 7 day pre-op liquid diet and day 3 was absolutely the hardest for me. I've been weak more than anything. The protein shakes do seem to perk me up though so that helps. I also have been using peach tea crystal light in my water to help me get the 100oz of water that my dr. requires. Hang in there! Every day I wake up and tell myself "I can do hard things" and aren't we all proving to ourselves and those around us exactly what we are made of?! This is a marathon not a sprint... Hang in there, you got this!