Is the swelling affecting the way your pouch fits, potentially allowing leakage? You may need to make adjustments to prevent leakage until the swelling goes down.
As for the dark and runny stool, people with colostomy can get diarrhea the same as any other person. If it's extremely liquid-y, there's stuff you can get by getting a prescription from your doctor to put in the pouch to thicken the liquid to a paste.
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