Not in your DDC, but had to reply. This happened to me, too! I am so bummed (no pun intended)
I think it had a lot to do with the constant sitting and nursing! Booo! Try to side-lie and nurse when you can.
What really, really helps mine feel better is breastmilk on a cotton pad (like those round makeup pads, a little larger than a silver dollar?) and shoved up there against it.
Preparation H never did a thing for that horrible throbbing, but breastmilk soothes like nothing else! I express some every time I poop. I can't tell that mine is healing, really, but at least it doesn't hurt like the dickens anymore.
Yay breastmilk does it again!