Were the drops to remove ear wax nigela?. Muffled hearing would hint at that.
The ringing could be a sign of tinitus (which I suffer from).
When you say your ears are stinging, do you mean inside the ear, or on the outside.?
I would not associate these type of symptoms as being associated with the menopause. When you go back to the doctor suggest that you should be referred to an ENT clinic.