you know, the last 10 or 15 minutes of this movie gave me a really bad feeling deep deep deep inside...
i actually had my belly hurting...
awful
absolutely awful

and now i'm reading the novel "requiem for a dream" by hubert selby jr (in fact it's an old book from 1978)... you should read it too
i bought almost everything this guy wrote... veeeeeeeery good... you should take a look at it