The symptoms you are experiencing might be related to choledocholithiasis (bile duct stones)... pancreatitis which might be happening after gallbladder removal...Bile salts are released into your stools by your
liver, giving the stools a brown color. If your liver is not producing enough bile, or if the flow of the bile is blocked and not draining from your liver, your stools will be pale or clay-colored...I would suggest you to consult your surgeon and get examined as early as possible they will help by treating your condition based on certain lab investigations reports. Regards.