The SGB injection was originally given for pain, so pain doctors are a natural for this. The VA is doing research. There has been an astonishing toll of PTSD of course, on military personnel and contractors in war zones. Great hope for PTSD and CPTSD now since other treatments like EMDR seem to have such spotty results. I told my friend , a contractor in Afghanistan about it.
They are also using deep brain electrical stimulation for stubborn depression.
My mom had ECT eg electroshock reatments for depression decades ago, so all of this isnt completely new.