The diaper rash is back

It is terrible... poor baby is miserable. I have tried rash creams, anti fungal creams, prescription from the doctor, no diaper. We are trying an oatmeal bath in the morning. Now is it the soy or the apple juice causing the frequent diarrhea. I have been changing her 10 times a day... I am so tired of doctor run arounds I just want her to feel better. Anyway...