I had something similar happen to me, but instead of pounds of peanut butter i was substituting lunch for trail mix too often. One day I was passing white flakes that hurt like hell and it would come in waves if I tried eating any sort of nuts after. It's not peanut allergies, it takes a few days or so to feel these sharp cramps then I will be doubled over the next day. It looks like my bladder had dandruff.

I read it had to do with nut oils, and citrus supposedly counteracts it, so I eat oranges like mad if I ever feel it coming back and so far I haven't dealt with it again since. I'm really not the type to go over my diet or look into health things like this, but holy hell it hurt and that seems to be the why and also the how to help.