The symptoms you have described can be because of Eustachian tube blockade. Xylometazoline
nasal drops, and mucolyitcs usually help in this. In case the problem recurs, consult an ENT who can examine the ear, nose and throat to rule out any associated focus in these areas which can cause this blockade. The other possibility can be an infection of the inner ear
which most of the times is viral and self limiting. The stress
increases the chances of its development.