I fell in cross-country skiing yesterday, a couple of times on my butt... Today my tailbone hurts. I think. Is there anything you can do?

There are a few ways to reduce the pain

Ice or heat, the painkillers you usually take.

A good way to avoid pain is to avoid putting direct pressure, so by changing the posture of your pelvis it is possible to avoid pain. There are also specific cushions for coccyx pain.

In general there is no fracture in the mechanism you describe, but if the pain persists too long go see a doctor.