How much do you know about codependency? It may help a great deal for you to read up about it and realize that what you are experiencing may not even be guilt but just codependency.
Here is a post from the stickies above about guilt, have you read it yet?
http://www.soberrecovery.com/forums/...ing-guilt.html
Here is one on codependency
http://www.soberrecovery.com/forums/...ependency.html
But the most important thing you have to do is relax and give it time, this is a blow on top of postpartum. Realize with your brain that you will live and be happy even though your heart is hurting. Write it out on sticky notes and place around your home. Remind yourself you will get through this and you will thrive.