What Causes Left Sided Chest Pain Along With Nausea?
a lot of possibilities
Detailed Answer:
can only give general answers without directly examining you and....
Heart does not seem likely to be the cause, for the reasons you've outlined, but a stress test with nuclear imaging can often be done in this context.
Lung conditions often cause pain AND typically the pain changes in the rhythm of the breathing. (deep breathing triggers it).
Reflux is often the cause and if it is from the movement up into the esophagus and / or abnormal movement OF the esophagus (spasm) then the studies that just look at the stomach and esophagus usually don't find very much. On the other hand, drinking irritating stuff (ice water, spicey, carbonated, hot) often triggers the pain. Less often the isordil will relieve the pain. Antacid liquid if it changes the pain strongly implies an esophageal source.
The muscles and joints in the chest often become irritated. Often the deep breathing or position or movement will trigger the pain and this will be quite a clue
Those are most of the causes and most of the parts of the chest. Rarely a tumor may invade a rib and cause pain, or some other structure that is not normally present might be there and get painful. These are not common.