Hello,
Your condition can be coccydynia. It can be due to various causes.
We will need to know more details to comment further regarding treatment specifics.
But in the mean time, you should be using Coccyx cushion (donut shaped cushion). It will help in reducing the pain and relive the pressure.
You can sit in a tub filled with warm water everyday to get relief from pain.
Pain will not be relived in a single day, it will take time, but analgesics will help till then.
Connect for further details if you need.
Next Steps
Use coccyx cushion
Sitz bath