Tailbone Pain

Hi, I have been suffering with tailbone pain, the last number of months. It may have started back in Feb after it was very tender doing situps. I noticed then when I touched the area between by bum cheeks it felt like it was sticking out and I could move it side to side and up and down? I didnt think this was normal so I asked by GP to go for an Xray. It came back clear and I was given anti-inflammatory drugs and I bought a cushion. I still get the mild pain/ dull ache, sometimes it goes up through my lower back and it can be still tender to touch and moves, even though I am doing everything not to put pressure on it. Any advice appreciated