I too had less-than-desirable results when I tried Brazilian treatment, in addition to having to deal with the scent of the chemicals again every time I washed my hair for the following month. I've gotten the Keratin many times and have never had a problem with it, though you may be warned against coloring your hair.
It sounds like the Brazilian Blow-Out, like most chemical straighteners, dries out your hair immensely. Do hairdressers recommend a hair oil or anything like that? It sounds like that might help a lot, along with regular maintenance.