Fatigue has always been a huge issue for me. Even when I'm in remission, I sometimes still experience some degree of fatigue. I'm not alone in this either. 80% of patients with active IBD and 50% of patients in remission report that they experience fatigue. What do you do to manage fatigue, either in remission or during active disease? This can be how you manage it in terms of your career/school, relationships, leisure time, mentally, in regards to your usual household chores, etc.
I've included a link to the Crohn's and Colitis Foundation webpage that discusses the causes of fatigue. If you can identify a cause of your fatigue (for example, your vitamin D is low), then it can be easier to come up with proactive solutions to help get to the core of the problem. However, I think there are times when there isn't a solution as simple as just taking a course of high dose Vitamin D, in which case, knowing how to mentally balance your fatigue against all of the other demands of life can be really beneficial.