Do I really need to go to the doctor?

I had an injury with a hacksaw the other day. I cut into my index finger and a lot of blood came out. It stopped bleeding very quickly and seems to be healing well enough. But, the inside of my finger (towards the thumb) is numb. Ideally, I would have gone to the doctor, as it would be better with stitches, but I live in america and dont have health insurance.
So I cut my nerve, I guess. Will this heal over time, or does a doctor need 2000 dollars to stick a tool in and wiggle it around or whatever? Are there any products which stimulate nerve growth?
THX