Hello~Some ear infections are due to food allergies, are you aware of any allergies to foods? Also, you could have Candida, this is a type of yeast infection that can cause infections and fungus in the ears. I would go back to your doctor, tell him/her what is going on, and ask to be tested for these issues.
To treat a fungus, take a good, high potency pro-biotic, this will help to put the friendly bacteria in your gut.
Hi if you think it's getting worse Please go to the A/E best safe than sorry , take care