Why do people with manic depression feel very good and positive about themselves and then opposite?

why and how is this? is there a way to naturally balance the two sides or is the manic side really the right one? thanks for your answers ? why does the depressed side feel the way it does? why do some feel mostly depressed, instead of manic? to the first answerer, yes, but could [...] http://bit.ly/mM5jNm