it is definetely about fighting heroin addiction (tender is the day the demons go away - tender is the ghost the ghost I love the most, hiding from the sun, waiting for the night to come)and trying to find the same feeling (waiting for that feeling)in the love for a woman (so that he can heal his mind). It s a similar situation to Fitzgerald's novel, but the breakdown is due to his "schizophrenia" (caused by the struggle with his addiction that is "screwing up my life") and constant affairs with heroin, that are ruining his relationship with the one woman worth fighting it (tender is the touch of someone that you love too much).