Hello - thanks for asking your question.
Feeling a "presence" in your esophagus absolutely needs further workup with either a gastroscopy (preferred) or a barium swallow.
There are multiple causes that can cause this symptom, which should be discussed with your personal physician. These include benign tumors, caustic esophagitis/stricture, diverticula, malignancy, peptic esophagitis/stricture, esophageal rings/webs, achalasia, esophageal spasm, scleroderma or functional dysphagia to new a few.
A gastroscopy or barium swallow will help in the diagnosis. The appropriate treatment will depend on what is found.
I strongly suggest follow-up with your personal physician or gastroenterologist.
I stress that this answer is not intended as and does not substitute for medical advice - please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.