Hi Hope this message finds you in good health. I have gone through your complaints and understand your concern. I generally see many cases like this at my clinic.I give them a splint,rest,analgesics,anti-inflammatory tablets and ice pack till the pain reduces to some extent. Then i get an xray and if necessary an mri done to find out the extent of inflammation. In your case,the tailbone region must be having some sort of inflammation ,either in the bones,ligaments or soft tissue region. scratching is due to some allergic response to inflammation. try avoiding to sit on the area for prolonged time . hot fomentation,analgesics, rest might help. take anti allergic tablets for itching. usually these cases have a good prognosis and you should eventually get back to normal in coming few days.Nothing to worry about.Do get back to me after ur mri reports are ready. I hope your question has been answered. If you have any follow-up queries,feel free to consult me anytime. Thanks,Take care,God bless.