breaking nails

yes i know postings of polish has been sllloooowwwww.....im thinking about giving my nails a break for a couple weeks (or as long as i can stand it) because my nails keep breaking. they have, for some reason, gotten thin. they're not as hard as they used to be and i cant stand the breaking anymore. i think im gonna get some prenatal vitamins this friday to help with my nails. if any of yall have any suggestions on what i can do for my nails constantly breaking, id greatly appreciate it. the base coat i use, orly calcium shield, is not working so do not bother to spend the money on it.