I'm so sorry to hear of the issues that you and your wife are going through. I can't begin to imagine how difficult it must be for both of you.
After reading your thread, I immediately thought of some kind of dementia problem, possibly Alzheimer's. Here is what I found from the Mayo Clinic about symptoms:
Quote:
Changes in personality and behavior
Brain changes that occur in Alzheimer's disease can affect the way you act and how you feel. People with Alzheimer's may experience:
Depression
Social withdrawal
Mood swings
Distrust in others
Irritability and aggressiveness
Changes in sleeping habits
Wandering
Loss of inhibitions
Delusions, such as believing something has been stolen
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Here is the link to that page:
Alzheimer's disease: Symptoms - MayoClinic.com
Of course, I'm not a doctor and can't diagnose but I do believe that this is something worth looking into if for no other reason than to rule it out.