Ear infection that won't go away HELP

Li

My 7mo daughter has had a double ear infection on and off for over a month as well as a cough and congestion (the main reason it won't go away). Luckily no lasting fever. Her ped just prescribed her 3rd set of antibiotics in just over a month, I am worried about her having to have so much this young, but feel like I have no other choice. I've tried steaming the bathroom, humidifiers, nose frida, raising her mattress, zarbees, and keeping her home from daycare for 2 weeks. Anyone have any other ideas, I feel like I've done everything and nothing has helped. Has anyone had a baby get tubes in? How young and at what point did they decide to do it?