Chest/rib aching on left side. mid-back pain when bending. ekg, chest xray, blood work clear. overly sweaty sometimes (esp. night). er thought pleurisy but naproxen doesn't seem to help. thoughts?

Yes: The problem could be in the thoracic spine -- talk with your doctor and get a good imaging study of your mid back.

Spinal misalignment: Could be a slip disk or simple a vertebral misalignment compressing a nerve. Consult an orthopedist or osteopathic physician. Some people try reverse gravity (hanging up side down) to align the spine.

Nerve pain: The rib cage discomfort may be due to pressure on a nerve caused by a spur or disc in the midback spine. A deep breath can also pinch the intercostal nerve which runs between ribs. I recommend an evaluation by an orthopedic surgeon who will order the appropriate images.