I don't think Villette was yelling at you. I think she is just concerned that the meds aren't working. Opening up the skin can become dangerous because then there is a risk of infection (staph...).
Ellie makes her ears bleed also. It is an allergy to corn (she has no rash). It was acquired from leaving her on a garbage food for too long. We use synotic when it flairs up. We also pulled the food with corn in it. She is doing better but when a corn flake falls...itchy ears.
So if the vet doesn't know what to do and it might be an allergy I would change food and ask for synotic. Otomax should have taken care of the yeast.