I'm searching two stories:
1- (I think it's really hard to find this one!) It's at least 6-7 years old, i think the name should be something like "Diaper vacation" or "Diaper cruise". A wife goes with her husband to a psychiatrist that hypnotize him. When she says "You're not potty trained" he completely loses bladder control. If i recall correctly the psychiatrist name was "miss babbifier"
2- (This one should be easy). It's 2-3 months old. A mother makes his son (that is gonna go to college soon) listen to a tape and he starts wetting the bed. He starts wearing diapers and he likes it.
Thank you