Re: Cuticle pushed back, bottom of nail showing. Eeeek!
Okay, if I am correct, you didn't pull the nail loose, you just cut the cuticle. Treat it as a cut; keep it clean with peroxide and apply antibacterial ointment for the first couple of days until the pain goes away. Keep it wrapped with gauze (no bandaids) while you are working to prevent further injury. Once the cut has healed, it should be fine. As long as the root is intact, the nail will continue to grow.