Chronic diarrhea is a common symptom of both. However constipation can be a problem too. In ulcerative colitis, constipation can be a sign of inflammation in the rectum and in Crohn's disease it can be a sign of an obstruction in the small intestine.
Does the  go before or after the period. I was taught in school, when I was growing up, that the ending quotation mark always goes after the period. However, in college, I'm noticing that's not always what is happening. Same as when I sometimes read news articles. She took her to the party and she remembered saying, have fun.
Use a single quotation mark to begin it and punctuate it as you would a regular quote, with the period coming before you close the quotation with a second single quotation mark. Normally, a quote within a quote like this will be brief, since people usually use only short direct quotes from another person.