Enlarged red cells, or macrocytosis, is not a disease nor disorder, but can be a sign of a number of relatively minor problems of which alcoholism is only one. It can also indicate a deficiency of vitamin B-12 or folate, liver disease, chemotherapy, or even can be a result of the bone marrow trying to compensate for anemia due to any cause including a one-time blood loss.
Most of these problems would have showed up in a routine comprehensive metabolic panel blood test, which may well have been done at the same time as the CBC which showed up the large red cells. Again, macrocytosis is not a disease and is not problematic in itself.
Sludge in the gallbladder is another problem entirely, and could possibly cause biliary colic (gallbladder "attack") but is usually left alone in the absense of any symptoms. It is made up mostly of cholesterol, and eventually forms gallstones, which may also cause gallbladder problems -- or not.
I hope this answers your questions. Best of luck to you.
John Kenyon, EMT, CCT
Non-invasive cardiology tech, Emergency and Critical Care technician, Critical Incident Stress Mgmt. specialist