I am not sure you want to call attention to a DUI as a reason for being TDIU. If you have PTSD or any other MH condition try and separate that out from alcohol or drug abuse. The VA denied my IU the first time saying I was unable to work due to opiate addiction. This was not true, but it delayed my IU by almost a year. I know substance abuse is common to many MH issues, but when it comes to working what I would want to share with the VA is the facts of my symptoms that make it impossible to work other than substance abuse. It is in your records, but focus on the emotional illness. The VA does not consider alcoholism as a compensable mental health disease, nor drug abuse. The consequences (non-functioning liver) could be SC'ed. You have to draw it all back to the compensable mental health issue and show that symptoms are due to the PTSD, depression or whatever else. I just think you don't want the VA to have a string to pull on to blame all your problems on alcoholism.