hello and welcome to HCM,
As your ENT has mentioned that the dizziness
comes because of cough
, it is basically a neural problem. Nevertheless, the ENT can do a full work up including audiology and CT of the temporal bone
to rule out any ENT cause of the giddiness.
Once that is done then he can also advice you on the vestibular rehabilitation
measures and also the proper dosage of the anti vertigo
drugs as an ENT is most familiar with them.
Furthermore since the cough causes giddiness, then the ENT can investigate for the cause of cough and probably get a cure for both the cough and giddiness!!
take care and get back to me if possible
Dr Sriram Nathan