thats probably air. i have that alot especially now i am on dialysis. i went to ER for similar pain and they just gave me pain killers and sent me home.

You do need to find another hospital or go to a walk in clinic. Don't take no for an answer.

Costochondritis (or costochondritis in Spanish) is the medical term for inflammation of the cartilage that joins your ribs to your breastbone (sternum). This area is known as the costochondral joint.

Cartilage is tough but flexible connective tissue found throughout the body, including in the joints between bones. It acts as a shock absorber, cushioning the joints.

Costochondritis may improve on its own after a few weeks, although it can last for months or years. The condition doesn’t lead to serious problems, but may relapse.

Costochondritis causes

Costochondritis is an inflammatory process largely caused by poor posture with a rounded middle-back, thoracic and chest-joint stiffness linked with lack of exercise.

Normal pleural lining and pleurisy
Pleurisy
Pleurisy (PLOOR-ih-see) is a condition in which the pleura — a membrane consisting of a layer of tissue that lines the inner side of the chest cavity and a layer of tissue that surrounds the lungs — becomes inflamed. Also called pleuritis, pleurisy causes sharp chest pain (pleuritic pain) that worsens during breathing.

It could be pleurisy or costochondritis. Report that doctor. It is his job to check you out