Having colitis does not prevent someone from traveling, let alone not meeting someone for over 10 years. There are medications that treat colitis very successfully. It's a fact. My son has colitis and there has never been a time in his 26 years of life that colitis ever prevented him from traveling, and we travel VERY often (at least 3 or 4 times a year), including internationally. We just traveled to Europe this summer for an entire month and we just came back from Bermuda less than a week ago, he had zero issues that taking his meds couldn't handle. Not only does he travel all of the time, he's an athlete who's played soccer since childhood, including high school and college, he skis, hikes, rock climbs, runs marathons, races cars, scuba dives and has his pilot's license, I could go on and on and on. All while living with colitis. Is he on a special diet to control his colitis? Absolutely. Does having colitis sometimes interfere with things? Sure, but never enough to put his life on hold for any extended amount of time, let alone for an entire decade.
You are looking for excuses and grasping at straws. Even IF it was a disease that prevents travel (it doesn't), why on Earth would you ever expect to get approved after having not seen your fiancé for an entire decade? No lawyer is ever going to get around that fact. Any lawyer from Catholic Charities is free of charge and most likely knows little, if anything about immigration. Any immigration attorney would have told you straight up that you had no chance.