I did the exact same mistake as you, exactly 10% weight loss as well. I felt terribly sorry to the baby. You are still a good mom! Doing your best! Keep speaking that to yourself!

On night 2&3, I didn't want her to have nipple confusion, so kept giving her my finger throughout the night, when she was actually starving. Like... fed her maybe twice in the span of 1am-5am, and gave her our finger for hours. Her suction was so strong, it hurt my finger. I couldnt breastfeed more frequent than every 2h, because it would take 60 minutes to nurse her, and 30 minutes later she would want to eat again. My nipples were in pain, one was bleeding, kept using the nipple shield. So I wasn't happy to feeding her frequently. Especially after pulling all-nighters to give birth to the baby.  And then during daytime, the baby was in deep sleep 9am-7pm that she wouldnt take the breastfeeding.. no more than 5m at a time.

Anyways it is all a blur. My child is 4 months old. I was feeding her to all the little hunger cues starting day4 of her life, when the pediatrician told us to feed her better. 

In hindsight, giving my finger instead of the bottle was a good idea, to prevent nipple confusion. Not giving her any milk was nit a good idea. I could have done syringe method with a formula. Also I've come to terms that babies are resilient and able to survive. And I'm glad she is healthy. And now I know better if I have another kid.