The first thing i think of is sodium. Do you eat alot of salt? Eating a vegtable diet can really make you pee like a horse when the sodium levels goes lower.
Do you have any kidney dieses? diabetes? edema?
Brittle hair is a sign that the hair do not get propper nutrients most likly due to unclean blood. Do you do liver flushes? Liver Flushes can acutally couse these problem your describing until its all clean.