Welcome, and it sounds like you're ready to do this. I agree with you that the guilt and shame involved with alcoholism are so hard to deal with. That is the way the disease keeps you hooked. I felt so ashamed and miserable that I would end up turning to alcohol again and again.
I think that starting an IOP Program on Friday is a good start, and so is talking to your doctor. And, do not underestimate the importance of self-care. Sometimes we need to stop and look after ourselves, as well as caring for those around us.