What Do Diarrhea And Weight Gain Despite Lack Of Appetite Indicate?

I am 79, and had Graves Disease in 1984, treated with radioactive iodine. Presently I take 88mcg levothroxine. I have fatty liver and a large gallstone. I have been putting on abdominal fat in the last year, and weigh around 160 pounds. In my 20 s and 30 s my weight was 120 - 130, and I was just over 5 feet 7 inches. For the past 19 days, I have had diarrhea. During the first week when I was eating very little, I gained 2.6 pounds. I cannot see my doctor until April 20.