“Can I go to the ER for an ear infection?”

You can if you want -- but you may have to wait for many hours if it is a busy ED--as the sickest patients are usually "triaged" to be seen first. Less sick patients (i.e., patients less likely to die or suffer harm if treatment is delayed) have to wait until the all of the sicker patients are seen first. You are better off going to a primary care MD or an Urgent care clinic for appropriate treatment.