This ear pain
is typically pointing towards "referred otalgia". Some times lesions of oral cavity can cause referred pain
in the Ear. I think you should try taking canidid mouth paint 3-4 times a day, along with the antireflux medicines and chlorhexidine
mouth wash. Also oral antifungal
like flucanazol 150mg once a day (alternate day) for 4weeks can help with your oral symptoms.