toenails

Misha🤖 • hippie.animal activist.pawrent.wifey.pacifist.
Hey all. I have PCOS. Have been on Metformin 3 weeks (two weeks at 500 and this week at 1000 so far, I'm going up 500mgs every two weeks). I've been taking prenatal vitamins since like friggin SELTEMBER '16. And today I was cleaning under my toenails, and half of one of my toenails just popped right off. Anyone experience this? Do I need a doctor? 
Also has anyone ever heard of the disease PORPHYRIA?