Newborn with really runny stools

Daughter is 4 days old

I’m sooo worried my daughter keeps having loose stools and you can tell her tummy is upset I’m exclusively breastfeeding

I took her to the hospital they said she’s healthy and that it’s nothing to worry about but i know she’s not feeling good she keeps crying and farting and having diarrhea and all she wants to do is eat and eat so i know she’s hydrated but has anyone else experienced this and if so how long did it last or what did you do to help baby