Okay I need help. My baby keeps farting with some poo and it’s been constant all day... I’ve left…

Okay I need help. My baby keeps farting with some poo and it’s been constant all day... I’ve left the diaper off and given her several baths but she’s literally in so much pain idk what to do anymore. I’ve been using cornstarch, a&d, and I’ve also tried destin but it kills me to even touch her because she starts crying. She’s had way worse rashes but has never acted like this so I’m sure her belly is hurting as well. I don’t know what to do at this point