Maybe you are suffering from a pharyngeal diverticulum which is an out pouching (like a small bag) from your food tube(esophagus
). It could feel like a lump and cause bad breath
as well. A barium swallow study of the esophagus and an endoscopy
will confirm the diagnosis and it is very much treatable. You need to consult with a gastro-enterologist to do the tests first.