msgz I concur with all the above posts. As a long retired nurse I confess that I am not up to date. However, Ulcerative Colitis is a very serious condition. I would suggest that you take your condition seriously and forget about trying to pass a medical by basically lying by omission.
And don't underestimate South African hospitals, they are excellent. A couple of years ago I discovered that one of my three episodes of flu had actually been glandular fever.