"The old woman never had any trouble until she bought herself a pig." I always thought it sounded better in Polish, but I can't remember it!
It goes "Nie miała baba kłopotu, kupiła sobie prosię." Here you have lots of other Polish sayings: pl.wikiquote.org/wiki/Przys%C5%82owia_polskie
A old Polish remedy for styes is to rub the infected sore with gold, usually a wedding band.