Pain in my tail bone appeared over night but is getting worse as the day goes on. Especially hurts when getting up/walking but also hurts to sit now?

Coccydynia. There is a medical condition known as Coccydynia that refers to pain coming from the tail bone (coccyx) itself, there are also other things in that area that can cause pain such as a polo ideal cyst, for example. I would not hesitate to be seen for an accurate diagnosis and to discuss treatment options.