PTSD is a medical condition. Treat it as such. PTSD presents itself in two forms... one of hyper vigilence and the other, becoming a wallflower, as you say, mopeing around, avoiding interactions with life in general.
Simplify your diet, don't consume anything that stimulates the nervous system. Quiet your environment.
Living a life that mimics camping in the forest offers wonderful benefit. I've known of folks who limited their exposure to electrical power lines, electronics, to the point of living off grid who then experienced healing by returning to a lifestyle of natural circadian rhythm.
Research the circadian rhythm.
We're living in unnatural conditions disruptive to our nature and which affects the nervous system and consequently our health.
Difficult? There are trade offs. We acquire nervous disorders due to artificial lifestyles.
Check out research on nature's circadian rhythm.
http://en.wikipedia.org/wiki/Circadian_rhythm
Adjusting to changes like daylight savings time causes harm...
http://www.sciencedaily.com/releases...1024123249.htm
Incidences of accidents go up after changes to our clocked schedules.
And if what I've said to this point does not convince you...
....Check This out!
http://www.samgoldstein.com/node/144
My aplogies if I've offended anyone.
Warm Regards to All.