Yes, I had grey stools when I had a gallbladder stone blocking my liver duct. They said if they hadn't caught the problem that I may have needed a liver transplant. Don't delay, get to the doctor fast. Are you in pain or feeling nauseated?
Well I had pain and was very sick to my stomach. At the very least it would be good for you to call your surgeon. Grey and white stools mean your bile is not reaching your intestines which darken the stool, as I recall.