I'm so sorry Lindsay. I know I would feel tremendously sad if I couldn't breastfeed, and to have someone that you trusted betray you like that in the midst of your difficult postpartum period...ugh, 'that sucks' doesn't even cover it.
I actually haven't talked to my MIL since DD was 5 days old. She was also staying with us in order to help, blew up at me over an issue concerning DS, left(while I was still in pain recovering from a c-section), and we haven't spoken since...and we used to have what I thought was a really great relationship. NOT anymore. DH had to work, so we actually had to call one of DH's co-worker's mom, a really nice lady that DH knew but that I had never met before, and she came for a couple of days to help me out with ds and stuff, and then my mom flew in two days later. I'm not going to go into what the issue was about, but I totally get that feeling of betrayal and I KNOW my relationship with my MIL will never be the same again. I would really rather not talk to her at all, but she is my DH's mother and my kids' grandmother, AND she lives like 10 minutes away, so I guess I don't have much choice.
But anyway...just wanted to say I understand, at least a little, and that I am also proud of you for taking care of yourself, even though I know that wasn't an easy choice to make.
Hang in there mama. Hopefully you can get donated milk, and even if you can't, that isn't the only way to bond with your baby.
I think you're doing a great job.