Welcome to JustAnswer! I would be happy to assist you. I am a 2003 graduate from UC Davis and a Medical Director of a veterinarian practice.

Hello,
Well, as I am sure you understand, I must strongly advise getting into a vet.
Also, with a yeast only infection, antibiotics would do nothing. So, more inclined to believe, anyway, that this is both bacteria and yeast.

Ideally, although expensive, you need a culture test performed. This is a sterile swab from the ear, so the bacteria can be grown, identified, and the vet is told the best medication to finally kill it.
Best I can suggest without a vet is below:


Over-the-counter treatments for ear infections. None of the below therapies, alone, are recommended in the treatment of an active bacterial or yeast infection. These are my best suggestions:
Zymox

Ear cleaner recommendations:
TrizEDTA: A ear flush specifically designed to work with antibacterial ear medications to help kill bacteria:
TrizEDTA Cleaner

Douxo Micellar Cleaner

Epi-Otic “Advanced” Cleaner

Great Summary about Ear Infections

Hope that info helps
Dr. Andy

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Dr. Andy