It's a nasty injury, more usually caused by a prankster pulling out a chair as one is about to sit.
It's hard to be sure about that causing the scoliosis. Do you have any curvature in the family? More usually, the cause is a short leg. Have your husband stand behind you, place both hands on the crests of the hips (look up "iliac crest" at our sacroiliac joint anatomy page.) Are they obviously unlevel. Ask your chiropractor to check too. If there are xrays taken standing, they will give an indication too.
There are three ways to treat the coccyx. Firstly a donut cushion of some sort; it takes the weight of the nether region. Then there's an external technique that I always use first. It's simple and often effective in acute injuries.
However, in a chronic case like this, I find the internal coccygeal technique much more effective. It's not really painful, but it is awkward. Take your husband along with you. Not all chiropractors will do it.
Are you doing lower back exercises? That's important too, and you'll find them in the navigation bar at Chiropractic Help.
It's tough treating any chronic injury, doubly so when it has such deeper ramifications. But that's what I would do; I give you a fair chance of achieving fifty percent, perhaps more, pain.
Try not to have it surgically removed. There are important muscles attached to the coccyx.
I hope this contributes.
Dr Barrie Lewis