Sorry for the bad experience.
I use ACV enema for cleansing out after coffee enema. Since coffee has tendency to be acidic, I believe ACV will help alkalize it. I have never tried to hold it though. Still works good.
By the way I do home colonic using colema board, too.
I am just curious, why do you need to hold the ACV enema? What are you intended to achieve by using it 3 times?
One good thing is that you get rid off some Candidas.
I am no expert on these matters, but the potato skin thing might be some parasite.
I am sure some one will give you some better info.