My nipples hurt at night

Lauren • Hi I`m Lauren, I have a four year old girl named Macie she has Rett syndrome, she can`t stand,walk ,talk or use her hand`s, she`s our silent angel, we have been trying since we had Macie for baby #2 b
For the past week my nipples kill me but really only at night! They hurt really bad i wanna cry ,I had a few cramps today, like period cramps but my period not due for a few day's I took a test for it was negative ..