1. My younger daughter got a ear infection like no other a couple months ago, too. She went through 7 types of antibiotics, and some procedures. She also experienced anxiety from the hearing loss from one side. She described how she felt walking through stores and such with this blankness on one side. Fortunately she did regain most of the hearing in that ear.
2. The use of antibiotics can wipe out our good intestinal bacteria and set off a cascade of negative problems which indeed can affect the brain (and therefore cause anxiety, depression, mood swings, etc. (See "Gut, Brain, Bacteria, and Behavior" - http://itsnotmental.blogspot.com/2011/03/gut-brain-and-ba... )
3. The stress from all that has happened can further weaken our immune system, affect sleep, deplete nutrients necessary for energy and our brain neurochemicals.
4. I learned the long hard way that even a diagnosis of "bipolar" can be like that of "depression"... a label for symptoms - regardless of the underlying cause. Our medical/mental health care system is broken - if there are brain symptoms, often the medical doctors won't run tests or treat to find out why, and psychiatrists must give a label for the mental symptoms they see (necessary to even bill insurance) and it may have nothing what-so-ever to do with cause. So neither side digs to find cause - sometimes even when it is an endocrine problem! (see http://itsnotmental.blogspot.com/2009/02/psychiatrist-vs-... )
5 - Therapy can always help us grow and cope better (http://itsnotmental.blogspot.com/2011/12/dialectical-beha... ). ... and some people can and do recover from these symptoms. Here is a radio interview: "Mood Swings, Hearing and Seeing Things, Anxiety" - Interview with Recovered Adults (http://itsnotmental.blogspot.com/2012/07/mood-swings-hear... )