I just want to add that unfortunately the kind of behavior you are describing of your grandmother comes from how that generation believed that to get children to stop doing something you did not like, the child had to be frightened and punished. And those feet of hers pounding on the floor were most definitely meant to frighten you and she believed she was supposed to be angry with you and treat you in a mean way. That only traumatized you and what your flashback/memory is showing you is WHY you don't treat children the way your grandmother did with you, it just frightens them instead of help them "learn" and feel "safe" which would do a lot more to stop bed wetting. My older brother was a bed wetter too, but the reason he had a problem with that is because he was abused for struggling with something he could not help which was a learning disability.