Burning , hard heavy swallowing, pain in chest between the breast. what could be the cause?

Esophagus issue: These symptoms sound like an esophageal disorder. This avenue between mouth and stomach can become inflamed, leading to chest pain or fullness as well as difficulty swallowing. I would recommend you purchase Omeprazole over the counter, a once a day acid blocker that will likely alleviate symptoms. If not substantial improvement in a few days then seek out a gastroenterologist.