Most meditations are self-hypnotic (concentration on imagery, mantras etc) and can make a person feel detached and so less on edge. However one that I know of is "anti-hypnotic" in that it separates a persons awareness from being over involved in compulsive thinking/feeling. The US military just started using it for vets because its been helping people with PTSD in dramatic fashion.
Here is link to military version in case people are interested:
http://www.patriotoutreach.org/
Here are link to free civilian version downloads:
High Speed internet:
http://www.fhu.com/audio/downloads/b...still_mp3m.zip
Slow Connection:
http://www.fhu.com/audio/downloads/b...still_mp3l.zip
Nothing might happen the first time tried but when it does kick in you'll know it. Motivation is key and the more earnest people are the better it works. Old forgotten things can bubble up but they seem a 1000 miles away and dont cause much issue. Be aware that can happen though. You might feel worse instead of better at first because a lot of foul stuff has been buried generally.