I self-medicate with marijuana. I find it helps the anxiety and the nightmares. Now I found this medical research study that says much the same thing.

Does anyone else do this?

Mitigation of post-traumatic stress symptoms by Cannabis resin: A review of the clinical and neurobiological evidence

"...Cannabis may dampen the strength or emotional impact of traumatic memories through synergistic mechanisms that might make it easier for people with PTSD to rest or sleep and to feel less anxious and less involved with flashback memories... Evidence is increasingly accumulating that cannabinoids might play a role in fear extinction and antidepressive effects."

Full link to abstract here:

But he grew old, this knight so bold / And upon his heart a shadow / Fell as he found no spot on the ground / That looked like El Dorado.