My wife has Crohns, she was diagnosed about 10 years ago (the surgeon said she must have had it for years, because it was the worst "new" case he'd ever seen in someone only 24 years old). She was a few days from her intestines bursting (possible death) when she finally couldn't take the pain anymore and we went to the ER. She spent the next month in the hospital, having 2 major surgeries, the biggest of which removed a portion of her large and small intestines and the Ileum valve. She had a really bad month (which included getting addicted to Morphine and being fed through an IV in her Jugular vein), followed by a poor couple months, but it made her tough as nails. She dropped to about 90 lbs (at 5' 7"), and got so weak she could hardly walk. The good news is that she has been in complete remission since, with no signs of the disease in any of her Colonoscopies. She only takes Lialda (time released Mesalamine), which is an anti-inflamitory of sorts.
My biggest fear is that my daughters may end up with it since it's a hereditary disease.