have you ever not wanted to remember [wanted to forget] keep memories hidden [pushed/stored away, call it "repressed"] so you wouldn't have to feel (so you don't have 'regret').
but locked not so tight enough in your head, thoughts, feelings and dreams all flood in 'till your brain is bled. .. 'till your brain is lead .. down a dark road of hurt and deceit of abuse and lies, explosions that leave.. people who are ready for death alive, and boys too young in life just, .... die
well then my friend, there's your answer in its simplest form ("what's P.T.S.D?")