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From your history, your pain appears to be related to prolonged sitting and posture after delivery. Since you improved with physiotherapy, it is likely a mechanical musculoskeletal problem rather than a permanent injury. Daily ultrasound therapy is usually not required for long-term recovery. The most important part is learning the correct stretching and strengthening exercises, which you can continue at home. I would recommend consulting an Orthopaedic surgeon or for a proper examination. Depending on the exact location of your pain (lower back, tailbone, hip, or buttock), you may need an X-ray or MRI if symptoms have persisted for several months or if there is pain radiating to the legs. Meanwhile: Avoid sitting continuously for more than 20–30 minutes. Use a firm cushion or lumbar support while feeding. Try side-lying breastfeeding if comfortable. Continue the exercises taught by your physiotherapist at home instead of daily ultrasound sessions. Use pain medications only if prescribed and compatible with breastfeeding. With the right diagnosis and a structured home exercise program, most postpartum mechanical back pain improves significantly.

Your symptoms are suggestive of chronic coccydynia (tailbone pain), which can occur after childbirth and may worsen with prolonged sitting while feeding the baby. Since you have already tried medications and physiotherapy with only temporary relief, you need a detailed evaluation to identify the underlying cause. Most patients improve with a combination of activity modification, a coccyx cushion, targeted pelvic floor rehabilitation, and, in selected cases, image-guided local injections.

It is most probably coccydynia. Inflammation of the tail bone.