Almost finished with 2 week pre-op clear liquids/protein diet and feel terrible - jittery, dizzy, fatigued, brain fog. Getting 90oz (or more) water & 90 grams protein (4 Premier Protein) - around 650 calories - plus Barriatic Advantage PRE-OP vitamin. Surgery on Monday - scared that this will be my life after surgery, too. Lost 10lbs last 2 weeks and 50lbs since starting journey (315 to 265) but this is awful!