I think it may be just bruised, but three weeks ago I fell whilst snowboarding (repeatedly), all my other sprains and bruises are long gone, but my coccyx is still absolutely excruciating. I cannot sit with my back straight-I have to sit at a 45 degree (forward) angle so my weight is over the top of my thighs, and cannot then stand up/sit down properly. Not much pain when walking, but loads when sitting or sleeping (I keep waking up, and struggle to change positions), but it isn't to the point where I feel I am going to vomit or anything (unless I sit upright).
Don't know how to get xrays done with dd in tow!