hello and welcome to HCM,
First of all do not constantly clear your throat as that will worsen your situation. If you have a constant post nasal drip
you need to consult your ENT who will perform an Endoscopy
and CT of the sinuses
to confirm a diagnosis and initiate a treatment plan.
For the itch you do not have to do anything except get it examined by the ENT who will suggest you to not to meddle with your ear and not to use ear buds if everything is fine
take care and get well soon
Dr Sriram Nathan