Sometimes the foods you eat can cause wafer breakdown more rapidly and when this happens, the itch can drive you crazy. I found that I can usually stop or slow the itchiness by rinsing the inside of the pouch with cold water and be sure to splash it up around the stoma really well. That usually buys me 1 or 2 addt'l days of wear time. I usually get 7 days wear time anyway and can be really lazy about the change time. I also use Eakin Seals which really prevents breakdown of the wafer around the stoma opening of the wafer.
Let us know how it is going and what is working for you. It may help others with the same questions.
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery