Vegan fingernails

I notice that since becoming veg(around the time, at least) my fingernails have been in really poor shape. It's hard to explain exactly what happens. They break off into layers which come off(think sheets coming off a bed) in pieces and leave no strength in the nails. It's especially in the pointer and middle fingernails. I only paint my nails once a week, which I'd been doing for at least a year before going veg without problems. I get about 10% of my calories from protein, which I thought was enough. I also get enough fat, at least 15% of my calories, and take multivitamins. I can't see what I'm doing wrong and would really appreciate some help, because the problem just seems to be getting worse. Thanks.. I don't know what else to do but post here.