Blistered toes causing my nails to come off?

Well during track season i got new shoes and so i kept getting blisters and i thought it was me breaking them in, but turns out they were just crappy shoes. And so on my big toe and the toe next to it (on both feet) ive got so many blisters, that i can literaly just cutt off the tip of my toe and not feel it. and well my one nail just came off completely, and two on my other foot came off too. Will they ever grow back? and is there a way i can get rid of the blisters? thanx sooooooo much!