Oh Emily, have you ever thought that maybe YOU were not the "damaged goods" when you were born and put up for adoption? Many people do that not because they don't love their baby but precisely because they DO and they know they can't take good care of them like they should. I don't know about the family that adopted you, your family, but I suspect you are simply a product of your environment and would be so even if you were their blood.
All the problems are not all your fault. You have a lot of messed up people in your life. But the only one you can change, is you.
That fact will remain.
YOU are the one that is going to change this vicious cycle of dysfunction before it sucks in your girls.
You can do it.
A lot of people here believe in you.
We know it is going to be hard but we know that it can be done.
Try to make it to your Dr's appointment if at all possible.