There is a treatment called stellate ganglion block (SGB) for PTSD. The military is investing money into investigating it.
For diagnostic and therapeutic purposes, anesthetic is injected into the neck. It can offer immediate relief to PTSD. In May 2019 it was available at available at 12 VA hospitals. Might still be in trials.
“This is how the procedure works: a local anesthetic is injected deep into the neck to bathe a cluster of nerves called the stellate ganglion.
CBS News, “SGB: A possible breakthrough treatment for PTSD“
These nerves help control the brain’s fight or flight reactions, signals that go haywire with PTSD.
Doctors use a fluoroscope and contrasting dye, you can see it spread out next to the spine, to guide the needle to the stellate ganglion. When the anesthetic is injected it seems to numb, or turn off, the PTSD symptoms. It clears the body in a day, but the effects last up to 6 months, for some even longer. There are no known side effects.”