I have had Crohn's since I was 5 and now am 49. I never had D with it, always had C, until my first bowel resection. Unfortunately the answers to most of your questions are it varies so differently from one indvidual to the next. I have been in somewhat remission, at least pain free, for over 3 years. There is no cure for Crohn's so watching your diet can keep it in remission without medication. It did me for over 20 years, others are not as lucky. I rarely have blood in my stool except fresh from hemmies when they are at their worse. I took Pentasa for years and had no adverse side affects yet also felt there was minimal benefit. Yes complications from this disease affect my concentration and at times I do feel dizzy. My GI believes it is a result of the chronic fatigue that often goes along with it. CD can affect any part of the digestive from the tip of the tongue to the anus. I have restless leg syndrome probably a result of the lack of nutrient absorbtion from the disease, so I have leg issues every day. If you are having eye pain, see a doctor as soon as possible. I hope this helps answer some of your questions, but like I said, each individual is affected differently and have different results from medications and other treatments. Good luck in finding the answers you are looking for.
We can respond to irritation with a smile instead of scowl, or by giving warm praise instead of icy indifference. By our being understanding instead of abrupt, others, in turn, may decide to hold on a little longer rather than to give way. Love, patience, and meekness can be just as contagious as rudeness and crudeness.
RandyPlease allow HealingWell to continue helping others by donating: http://www.healingwell.com/donate/Dx'd with Crohn's at age 12. Symptoms since age 5, RLS, Depression, Anxiety, and down right feel yucky some days.
Learning to live with this Disease rather than be its victim after 36 years.