From the day you noticed you were having issues related to PTSD, what did you do? Did you go inpatient, just talk to MH, talk to your command? What was your journey before you were believed and had a MEB initiated?
This is different for each person and for you I see it is a very difficult path. You have somehow burned bridges with your command and your doctors believe you just want out and are puzzled by this because of your leadership position. Since you have already exhausted most remedies I recommend for the most severe command and medical misconduct those doors are probably closed too. Maybe Jason can provide guidance here but I believe the pre-discharge program is the best you can do now while also giving a post-service upgrade a shot if your medical file supports it.