Mine was confirmed by xray. I'd fallen whilst abseiling and, even with a helmet, a bit of jagged rock had been able to slice my head open at the base of my skull and the fall knocked me out.
But when I came to, the FIRST thing I felt was that tailbone.
Try lying on your side when you need to sleep, and standing actually made me feel better.
Frozen peas, frozen peas, frozen peas - a tea towel is usually too thick so go for the muslin cloth to wrap them in.
You can also freeze some water in a polystyrene cup and then peel back the side of the cup till you have an exposed bit of ice. That way you can rub the ice on the area and your hands don't freeze.
Or freeze 2 parts water to 1 part rubbing alcohol in a zip back. It won't freeze, it'll go all slushy and be the perfect temp for icing the area.
Yes, codeine+ibu for the beginning and prunes or prune juice and raisins because being bunged up when you've got a break there is BAD.
I second the rubber ring if you get a confirmed break.
It SUCKS.