What Does Pain In Tailbone And Pressure In Anus Suggest?

Hi, I started to have my tailbone pain together with anus pressure last Thursday. Whenever I lean my body up and down, I feel pain around my tailbone. As for my anus pressure, I always feel to have bowel movement even though I have already empty my bowel. Few days ago before I started to have pain on Thursday, I had some strange bowel movement eg. cramp pain in my lower and upper abdomen and a strong feeling to empty bowel in my rectum during midnight. Finally, nothing was out of my anus. Could you tell me what are my problem ?