Hello dear friend , thanks for writing to HCM You may Use ring cushion for sitting,it will releave pressure on coccyx With some medication [like DOLO 650 mg] local injection therapy will also work Calcium supplement with vit D will help in strengthening your bones Take rest , hot or cold fomentation avoid lifting weights Sit with taking support to your back Take siltz bath [sitting inleukwarm water] ,will cause suthing effect Physiotherapy like - USG ,has found effective in my patients. Sinus problem is not related to this injury and complains. I Hope your queries are answered For further query you can contact my profile directly