hello! as you have mentioned about the ear infection
it is important to know whether it is acute or chronic. As spherocytosis
is a kind of hemolytic anemia
, your immunity for the acute infection may be comparatively lowered. as far as no response from penicillin is concerened, it is itself a broad spectrum antibiotic but continued use may result in resistance to it.
i dont see any underlying problem as such but my advice would be to see a homoeopath for the infections.