I have done a barium swallow and endoscopy and they found nothing.
Hello,
A complete throat examination and work up may be necessary for determining the correct cause of your symptoms. From your symptoms it seems that you are suffering from gastro esophageal reflux disease or hiatus hernia. These conditions cause heartburn, difficulty in swallowing, feeling of something stuck in the mouth etc.A complete medical history, clinical examination and tests like endoscopy, barium swallow may be helpful. See a physician. He may further refer you to the concerned specialist ENT/gastroenterologist. Keep me posted.
Best luck and regards!