Your situation is like that of one who suffers from (urinary) incontinence. So you have to do wudoo’ when the time for each prayer comes. You also have to do wudoo’ for jumu’ah prayer after the second call, even if there are a lot of people.
With regard to your leading the people in prayer, it is valid according to the most correct view, but if you can find someone else to lead the people in prayer that may be better, because there is the possibility that you may pass wind and the people may notice it. Even though your prayer is valid, you should not let people know your condition lest they think badly of you. We ask Allaah to relieve you of what you are suffering from and to restore you to good health.