For The Last 4-5 Months I Have Constantly Gained Weight

For the last 4-5 months I have constantly gained weight (sometimes 10lbs/mo) I have as many as 3-4 bowel movements ending with a very loose stool and then it starts again. I have a craving for chocolate which I can guess doesn't help the weight gain. I don't have any pain the stomach, but I am tired all the time. What does this sound like to you