Mri says i have a tiny buldge in disc& when i sit there is severe pain in my tailbone and it started happening only after my injury. are they related?

What injury?: It would help to know what your injury was, however, if you broke your coccyx (tailbone), it would be expected to have pain in the tailbone when you try to sit on the broken bone. Get a pillow called a donut (shaped like one) or something else to sit on that is cut out in the middle. If it hurts only there, it is unlikely the disc is symptomatic.