With the severe yeast issue you are having I would either go raw, limited ingredient kibble, or homecooked with Nuvet supplement.
I would also invest in pharmaseb shampoo, followed with a vinegar rinse. I have found a new shampoo I like from Nuvet with tea tree but I think pharmaseb will work better in this case.
Wash bedding in free and clear detergent and fabric softener too.
Treat yeasty paws with either a vinegar water soak or get some douxo, malacetic or chlorihexidine type cleanser.
Malacetic ULTRA works great on tear stains. But I would only use that until you have things under control. Then just use witch hazel to keep the area clean and dry.
Let us know which food route you are going to take and we can keep helping
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