Your symptoms suggest coccydynia.(inflammation of coccyx).
Try:
1. Sitz bath ( A tub of hot water with dettol in which affected are has to be dipped in- 10 mins twice daily) for 10 days.
2. Medications like Enzomac, Tendocare and Ceftum will help. Orthocort for resistant cases.
3. Sit on a soft pillow or coccydynia pillow.
Coccydynia does not require MRI, it is a clinical diagnosis.
Next Steps
follow above treatment.
Health Tips
Avoiding direct pressure over affected area is keystone in coccydynia.