The terminology might be slightly different.
Ear, Nose and Throat doctors are specialists of those items only.
I did just a general search Googled Canada ENT Doctor and got this. So you can narrow it down to your area much easier.
Canada ENT doctor - Google Search
Also an Allergist or Allergy specialist. That should also be similar.
Sometimes on this side of the lakes the ENT and allergists will have a clinic together.
Get several specialist under one roof or same area of a bigger clinic.