Hi At a age of 24 cardiac origin of pain is highly unlikely unless you are a smoker or have history of cardiac disease.So hearing about your symptoms most likely diagnosis is costochiondritis Costochondritis causes localized chest wall pain and tenderness that can be reproduced by pushing on the involved cartilage in the front of the rib cage. Costochondritis is a relatively harmless musculoskeletal chest pain but is very painful. It is an inflammation of the junctions where the upper ribs join with the cartilage that holds them to the breastbone, or sternum. The condition causes localized chest pain that you can reproduce by pushing on the cartilage in the front of your ribcage.According to you ; you feel pain around sternum so most likely your symptoms are because of costochondritis One more diagnosis which comes to my mind is it can be Tietze syndrome ;often confused with costocondritis and is missed by cardiologists , the main treatment of costo is anti-inflammatory medicine and high dose steroids used for a short period of time, As you have written you can t take anti-inflammatory ;in that case you can take high doses of methyl-prednisolone for few days for relief .Antidepressants. Tricyclic antidepressants, such as amitriptyline, are often used to control chronic pain — especially if it s keeping you awake at night.gabapentin (Neurontin) also has proved successful in controlling advice 2D ECHO AND TMT FOR CARDIO CLEARANCE PHYSICAL THERAPY AND MEDS FOR COSTOCHONDRITIS