What Causes Chronic Dull Pain In The Coccyx?

Hello. I m a 19 year old female. 5 5 in height and 200 pounds in weight. Since December of 2014 I ve had tailbone pain. At first I had a cyst/ abscess which I found by accident by pressing straight down my lumbar region down through the center of my butt. The sinus area release a yellowish- white fluid with brownish red fluid which I assumed to be blood. It smelled awful. I was able to push the rest of it out with my fingers and the pain went away. Then around January the pain came back. I notice that when I flex my PC muscles like I m trying to stop my flow of urine my tailbone hurts. On a scale of 1-10 it can be around a 5, when I sit down it becomes a 7, and as I stand up it becomes a complete 9. As bad as it may seem my boyfriend and I have anal sex at least once a month. He is a little worried that he may have hurt me. Though I don t feel pain when we have anal sex he wanted me to see if something was wrong. I have been to my doctors office about it and she only prescribed pain medications. She tried to see if I had another abscess/ cyst and didn t fin anything she then had me take an X-ray and everything showed up fine. I ve been to her twice with the same symptoms and she only prescribes medications. I do not want to be dependent on meds my entire life since that can destroy my liver. Throughout the day my pain goes from dull and annoying to painful like when I sleep. I have done a hot/ cold compress and sitz baths but nothing has really helped. I m desperate to cure this. Please help. Do you know what can possibly help? Please?