Trying to avoid PPD

Planned a natural birth, ended in a c section, being away from my son and him not allowed in the hospital due to covid really made me depressed not to mention the bad experience to stay at the hospital for 3 nights. I want to breastfeed, she has no problem latching but she has a problem with wanting more than colostrum so I introduced her to a bit of formula last night. I've been drinking tea and trying everything, milk hasn't come in yet. Any tips on what to do? Should I continue to give her formula until my milk comes in? Will she even want my milk if she gets used to formula? I feel like a failure