Thanks for using ask a doctors service from doctor spring. I understand your problem and will try to answer your queries to the best possible .the pain as described by you at the tip of the tailbone is called coccygodynia. It is due to the inflammation of the coccyx. This pain may have been aggravated following trauma. Sustained during a fall, fracture. It could be unbearable to deal with the pain and simple activities like sitting become an uphill task. This condition is mainly diagnosed by physical examination where there will increase tenderness on touching the tailbone.
I would recommend a few steps to relieve the pain.
a) Try to sit in an upright posture on a chair that is well padded so as to relieve the pain.
b) use can use ice packs to reduce the pain or use painkillers like ibuprofen twice a day for a week
c) Gently massage the muscles near the coccyx.
If the pain were not relieved, I would recommend you to get an MRI to find out the cause, as an x ray is difficult to diagnose. You can consult your doctor with these reports. If all methods fail, you can also undergo a surgery-coccygectomy where the coccyx is removed. Hope this helps. If there are any further queries feel free to ask.