Must the bandage that prevents urine from reaching clothes be changed for every prayer for one who suffers from urinary incontinence, knowing that it is costly and difficult? And does suppressing the release of gas after ablution and during prayer affect the validity of the prayer or the ablution?

As for re-binding the area and washing it for every prayer in the case of one afflicted with سلس (urinary incontinence/chronic discharge), there is a difference of opinion. There is no harm, in case of hardship, in adopting the view of those who do not obligate that. As for praying while suppressing the urge to pass wind, starting the prayer in such a state is disliked. If the urge arises during the prayer, the worshipper should not break off the prayer unless there is a fear of harm.