It is labor. The pain is unbearable.

That is why they call it HARD LABOR. Childbirth classes are essential in knowing what is going on beforehand and knowing your options and being in control during a time when you feel no control at all.
The key to any child birth, whether medicated or not, is knowing your own power. I honestly believe that knowledge is power. Arm yourself with as much knowledge as you can get your hands on.
For instance, did you know that some women can get pain relief with water? Like a shower... or getting in the tub. Others like to have their feet rubbed. Just find what works for you. If you are dead set against pain meds, don't say... 'well maybe...' say, "NO WAY. I know my body and I know I can do this." Don't waffle. Because you'll get in there and the first thing you'll do is ask for something for the pain.
It is labor. It is painful. But guess what? It ends.