How To Get Rid Of Coccyx Pain?

hello i am a 20 yar old female with severe coccyx pain i cannot sit or stand up straight without pain it is also sore lying in bed and is waking me up in the middle of the night! i also have been peeing excessively as if i have been drinking litres of fluids when maybe i have one had a drink or 2. i have been to phsiotherapists, chiropractors and my doctor and no relief. could anyone help me please