L.K.
L.,
I would definitely get a second opinion at least. See an ENT doctor and maybe make an appointment for a consult at an allergy doctor.
My children never had ear infections, but my youngest had very very bad asthma. I had asked her pediatrician when she was young about allergy shots. He told me no that it wouldnt help, wasnt necc, yadda yadda. Years later I decided to take things into my own hands. Although we did not continue with the entire regimen (because i Hated the office staff and finally left that allergist) the series of shots she received over the months we went greatly reduced her asthma. To the point where she carries an inhaler but doesnt use it often, except seasonally.
I know I didnt help regarding the ear infections, but when you mentioned his fathers asthma, I thought I'd share my experience, just in case.
Good luck. I know its frustrating, exhausting and worrisome. He'll be ok and you'll find the solution.
L.