Getting discouraged

FTM my baby is now 4 days old

I have been exclusively breastfeeding since birth (born via c section) immediately after surgery while doing skin to skin, baby found and crawled to boob herself and latched and fed for 50 minutes. I cried with happiness thinking there’s a chance we can succeed with breastfeeding. The first few days were painful, she took a chunk out of both of my nipples...

I started using a nipple shield to protect the cuts and not have her get blood in her mouth but it didn’t help with any of the pain. We left the hospital on day 3 and she had lost 8% body weight. I went back the next day to check her weight again and now she’s at 12% so they want me to start pumping and supplementing on top of her normal feeds. Every time she latches I could scream I mean seriously I could punch something the only thing that helps the pain is petting her perfect little head and talking to her.

I tried pumping and there is no way I could do it (yesterday, I’ll try again today) so I had to get her formula.. they want me to supplement her with 15-30 ml of formula each time she feeds. I am devastated to have to give her formula. I have tried so hard pushing past the pain of breastfeeding and recovering from surgery and it’s not enough I can’t feed her on my own yet..

I need advice 😩 I don’t want to give up she deserves my effort....

What can I do to help the nipple pain?

When did your milk come in? Did it change your things?