How could having a healthy baby be a failure? Nope you are wrong you had a miracle, You have done the journey down and i think you should do it again.
You are sleeved already but i would get it checked out, But i would start as if it was day one of surgery - Do the week of liquids, then go to the pureed, and go back to the old way.
In the mean time you have the greatest reward. your son! So get healthy again for his sake