I had something similiar when i was really stressed out , they did a whole bunch of tests on me , i had heartburn , and felt like i constantly had to swallow and felt nauseated for months , they did an upper gi to see if i had an ulcer and i went on aciphex , a medicine for reflux . I would go to the dr. and see what kind of testing they can do .
It could be so many things, from acid reflux to an ulcer. I think you need to see your doctor to determine what is wrong.