I am really sorry you are feeling this way. It sounds like you are grieving over the loss of your best friend and rightfully so. I think one day she will know the mistake she has made and she'll be lucky to be able to crawl back and have you back in her life, that is if you choose to forgive her.
I remember you saying your cat was missing. Are you sure she was eaten, or could she have lost her way or gone on a walk about? My cat does that from time to time. He'll be gone for a month. The first time he did it I too thought he was probably gone for good. Low and behold there he was.
I had my dog put to sleep a few years back and I still get weepy when I go through pictures or see someone with a dog like her. She was a great friend. Better than any human friend has ever been.
I didn't know your turtle ran away. Was he an outdoor pet?
You are certainly no monster for thinking things were easier before the baby came along. You hold your children in high regards and it shows with how you speak of them here.
How long have you been on the meds? Do they need time to get into your system?
Girl, you need a calgon moment and a stiff toddy!
*HUGS TO YOU*