Hi, welcome to the forum, this feeling of
lump in the throat is known as Globus sensation. This is mainly seen
in gastro esophageal reflex disease or hyperplastic tonsil. The other possibilities are abnormal upper esophageal sphincter function, stress or psychological abnormality causes this sensation due to altered upper esophageal pressure.
Post nasal drip due to sinusitis can also cause such sensations. Do not worry, it is a self limiting condition and will recover in a week.