Diaper rash help

My little has been wearing the same brand of diapers since she’s been home from the hospital. I switched to a different brand since I couldn’t find ours in the store due to everyone stockpiling/panic buying. They broke her out in a rash so we switched to another different brand and the rash continued to get worse. We’ve tried about four different kinds of diaper rash cream (burts bees, buttpaste, A&D, and desitin). We’ve tried rinsing her off with water and my hands instead of wipies. We’ve tried letting her go diaperless to air it out. Nothing is working. I finally was able to find our usual diapers and it’s still not clearing up. Her bottom is blistered and so red. I feel so horrible and am feeling like I’m failing as a mom. It’s been like this for almost two weeks now but I am scared to take her out to the doctor due to COVID-19 being all over my town. Is there anything else I can do that might help or should I just take her to the doctor anyway?