I have an 8 year old Black Lab. who is having ear problems. Started out with ear odor and shaking of head. Went to the Vet. said yeast infection, gave me some ointiment, problem got worst, now dried blood and a strong odor, and a lot of head shaking. Is there a solution I can mix to put in his ear to help solve this problem, or is a expensive trip back to the Vet. a must?