I have pain in my coccyx area whenever I sit down. Been to doctors and they won't X-ray me. Worried incase it's cancer or tumour?

Coccydynia. This sounds like coccydynia, which is a pain in the tail bone which occurs after sitting on a hard surface for a long time or from falling onto your tail bone onto a hard surface. Can take a long time to heal up. You can try sitting on a "donut", that soft cushion with a hole in the middle that you find at the surgical supply stores. Anti inflammatories may help.