Idk what I'm doing wrong but one breast burns like hell when breastfeeding and the nipple is super…

Idk what I'm doing wrong but one breast burns like hell when breastfeeding and the nipple is super tender and sore. It's also producing less milk. 😕 any advice? Plus my lovebugg has reflux something awful and cries when nursing on that side. Idk if it's the position I'm holding him in or what... You guys experienced this?