Fall on tailbone several months ago on going back pain now it hurts to sit, seeing a orthopedist at the min said it strain?

Rigth : He is probably right sit on a padded cushion of some sort to help with the pain and cross your fingers in hopes that it will gradually improve which is quite likely.

Coccyx Injury: You could have a contusion of the tailbone known as the coccyx. If this does not resolve within a few weeks, i would consider seeing a pain specialist for a possible injection (ganglion impar block). In the meantime you may need a doughnut cushion to sit on.