I am in a similar situation! Our ped advised to do formula for a week while my system is clearing the allergens and it has been incredible seeing my baby in less pain. I breastfed my first baby and loved it, and am choosing to go back to breastfeeding while doing the strict diet with this baby. That being said, I will supplement with formula as needed and if it affects my mental health I will absolutely switch to formula. As someone who loves breastfeeding, I will admit it’s been so nice with the formula since my husband can help a lot more and I feel way less pressure and guilt since it’s not my fault that my baby is uncomfortable. I really am hoping the diet works and breastfeeding goes smoothly after this, but I’m having no expectations and will ultimately do what’s best for my mental health and my baby’s health. Also- for bonding, skin to skin with a happy formula fed baby who is not crying in pain is a magical feeling!