I got chest pain usually from 3-5am it is upper left back pain, kind of dull, but, if you take in a deep breath, at the end, is when you feel the pain, I did a chest x-ray that found nothing, I have done the work up by a cardiologist, which found nothing. But, I still have this waking me up in the middle of the night, could it be pleursy, pneumthorax or problems with cervituree of the spine, I have a degenerative disk in lower l4-5l region with endplate changes, but, I just take Ibuprofen and it helps with all pains, even the chest one
This seems to be musculoskeletal pain rather than a cardiac or respiratory pain. The pain getting better with analgesic is another pointer to it. Use methods like hot fomentation and analgesic gel application over back, they may benefit