When Joe Silverman developed Crohn’s disease at age 21, the symptoms started out mild. While the sight of blood in his stools initially freaked him out, what really bothered him was the frequent abdominal pain and bloating that occurred as his condition progressed to moderate and then severe. Dietary changes didn’t make a difference, so he began taking prescription oral anti-inflammatory drugs that are often used to treat certain bowel diseases, which alleviated but didn’t…