I've had this a few times through-out DD and I's breastfeeding journey, even when not pregnant... it is hard to explain but I know exactly what you mean, it did always pass but it is pretty hard to deal with when you're in the middle of it. Sort of like an impatience and I think it is just to do with being a bit over it/touched-out/needing some space/time.

Really hope it passes soon it is okay, if you do just need a bit of a break to try and just distract her for a bit before the next feed with something else, that is mostly how I got through it