LS33,
Your wounds are still new. That won't change for awhile, and the D process will create new ones.
I'm fully D now, and I can tell you that there is life after D. Your children can also go on and live an authentic life without lies, at least from you.
You're going to be on this rollercoaster for awhile. Its best that you prepare yourself for that ride. The advice others are giving you are spot on, take care of yourself so you can take care of your daughter. Go to the gym, and find things to do that make you happy on those 2 days that you don't have your daughter.
Most importantly, if you're doing IHS, is to not engage with your wife. Once she knows you're going to D, you may start seeing her AP or other men around. If you don't start doing the 180, it will be painful. There is a saying, "you'll really know who you married once you divorce them". This is so true. You'll start seeing her true self, and its best you start proactively protecting yourself, your daughter and your assets. Let her do her thing, and you focus on you and your child. I've got to tell you that its rare for a mother to only get 2 days of the week, and the father gets the rest. It says a lot about your wife. Start documenting that time you have with your DD, she might come back and change her mind b/c of child support payments.