Last night fell in the shower and wacked the tailbone of the rail on the shower woke up this morning and its black and blue swollen sore to sit down ?

Possible fracture: By your history, you certainly bruised your tailbone but it is possible if you hit it hard enough that you have a fracture in it. It would probably be wise to get in to know exactly where you stand. Applying cold compresses will help the discomfort. A anti-inflammatory like Aleve (naproxen) could help if no stomach or kidney issues. For further recommendations and diagnosis you should see your MD.