Pain since 5 months as you said,, any relapses in pain depending on your activity ? Which activity is increasing the pain ? Is this pain related to the delivery? Or trauma ? Need to see MRI report, if you have X ray coccyx , please upload.
Next Steps
Use ring cushion while sitting, avoid prolonged sitting.
Take anti inflammatory drugs, tab chymoral forte for 2 weeks.
For body pains , do blood tests
CBP, ESR, vit d levels,
calcium, phosphorus.