Does anyone have Polymorphic Eruption of Pregnancy??

This rash is unbearable. I have to constantly put hydrocortisone cream on it - it's all over my tummy and it will soothe it for maybe an hour until it gets itchy again. I'm 36 weeks and in the last three days it has gotten way worse. I really don't want to put a steroid cream on it that's any stronger, does anyone have any natural remedies they use?? I have also tried coconut oil, peppermint (helps cool the itch but doesn't last long) and lavender..