Pain in chest bone (middle/right). increases when i twist sideways. always have cracking sound when twisting left/right, it reduces the pain. by research, i may have "costochondritis".

Quite possible: The joints between ribs and sternum are mostly synovial, meaning they have a fluid filled capsule surrounding the actual joint...the first and last are fibrous. So discomfort/noise etc midway down the sternum is likely inflammation in the sterno-costal joint. NSAIDS may help, and consult a physiatrist or osteopath for more insight.