Hi. As you have rightly noticed the problem lies in the lower part of the neck. It is this area from where the phrenic nerve
supplying the diaphragm goes down and the nerve supplying the vocal cord comes up. As also you have a sense of fullness in the throat. A good CT SCAN
will help you to get a diagnosis and guide for further management. Of course go for Barium swallow as it may show something that the CT scan can not show. I hope this explanation helps you.