This is so true. Feelings of guilt is such a killer, but so understandable. Our youngest of 2 daughters has been a drug addict for almost 12 years. In and out of detox, in and out of rehab, in and out of jail. Can't keep a job; can't stay healthy. At least once that we know of she's OD'd and had to be given Narcan. She's now 28 and the last couple of years she's done better, but still fighting it.
All along my wife and I have struggled with the guilt wondering what we could've, should've done differently. No matter what it is, it's only natural to feel guilty when bad things happen to our kids. But God is good. He's brought us through it all and it's brought us closer to each other.