Yogurt doesn't really help unless it not only has live cultures, but the right KIND of cultures. That any kind works is just a myth. The fact that you not only have a still infected left ear but also now have an infected right ear is a matter of concern- you need to contact your GP about a follow up, because you may need a different antibiotic, and worst case scenario may have an antibiotic resistant strain. As to the yeast infection- you know that antibiotics make you prone to yeast infections now, so ask for a course of an anti-fungal like fluconazole to follow up antibiotic courses with. Not every doctor will do it, but it can be a time and agony saver if they will.

That's why you're supposed to eat yogurt if you're taking antibiotics. However if you're allergic to yogurt, that sucks