Welcome to HCM,
It seems that you might be having impacted wax in your left ear giving you this problem.
consult your doctor and get your ears examined.
If ear wax
is there, put some wax dissolving ear drops for few days and after wax loosens the get it removed.
if wax is no problem then some infection or chronic cold
or some nerve
problem might be there.
Do not allow water in the ears while taking bath and clean ears after bath.
Ok and bye.