Ok this is an embarrasing problem I have here. About 2 weeks ago I noticed horizontal cracks on the base of each of my big toe nails. They were deep cracks and they were beginning to peel. So I used my clippers and clipped upwards. But I couldn't clip upward after I clipped half way up my nails. So I have the thick layer of toenail on the upperhalf, and theres a pink layer under it, which seems healthy. I tried to file down the upper half of the nail but it doesn't really work. How will the nail grow back? should I clip upward or let it grow?

Don't do anymore clipping! Whenever there is peeling on the surface of the nail plate, it is best to buff it off with a 240 grit buffer. You can get one of these at your local beauty supply. Buff lightly until the nail is just blended; do not over file.