For the last several weeks, I have been experiencing rather severe, smelly flatulence, extreme abdominal bloating (so much so that it is quite noticeable - I'm a relatively skinny guy, at 5'8" and 130LBS, and I look like an example of a distended gut due to malnourishment with the severity of the bloating) and irregularity, ranging between constipation and diarrhea at times. I am an athlete (cross country runner, training at around 30-40 miles per week) and consume protein-rich products on a regular basis: PowerBar protein bars, CLIF protein supplement bars, etc. I feel that consuming lactose definitely worsens my symptoms, but I seem to experience them intermittently regardless of my consumption of dairy products. Any advice on how to reduce these symptoms would be greatly appreciated, as they have begun to interfere pretty heavily with my social life, and are generally extremely unpleasant.