How Do I Fix My Broken Nails?

I broke two of my nails on my left hand today (my middle and ring fingers... how I got them is a long story). Both my nails cracked in the middle then tore right off. I happen to have extremely weak, brittle nails. When the nails tore off (especially on the ring finger) they tore off at least half my nail bed so now I have these ridges in my skin. They are also now very short, swollen, (and again on my ring finger I have this painful scratch. It was bloody before, but I cleaned it out, so all that's left is this scratch like thing.) I've never dealt with a broken nail before because I've been a nail biter all my life and have only stopped a few years ago, so I really don't know what to do in this situation. Any suggestions?