her fussing could mean she is feeding in a slightly different way to what your nipples are use to so they are 'wearing' sort of like they do in the beginning (does that make sense?)
I would suffer from bf aversion, was just over the whole thing at times, it could be AF, it could be the fussiness, I found it does pass and had to tackle one feed at a time. Are you getting any time out of the house on your own? even just a walk around the house? having the chance to clear your head is important too