PUPP any dealing with it??

Hope
My stomach has been INCREDIBLY itchy lately (38 weeks and 4 days today!) i had a doctors appointment and she told me i had PUPP (a rash that causes bumps on my stretch marks) she prescribed me a cream but it unfortunately has antihistimines which i am allergic too and can't take or use. Any mommies out there that have a home rememdy that helps?! Please i am desperate this itchiness will be the death of me 😭😭