Please help !

So I'm 10 says post partum and a huge rash has pooped up on my sides, and spreading down my legs. It's very itchy and bugs me. I went to the Dr and he said id have to be put on steroids which means I couldn't breastfeed my baby for 2-3 days. Which I'm scared of because she's sooo good at nursing! And gaining weight. Anyway. What can I do to possibly get rid of this without steroids?