Answer:
Dementia
Explanation:
Dementia is caused by Alzheimer’s disease which is characterized by uncoordinated functions of the brain. These uncoordinated functions leads to loss of memory most of the time. It could also lead to irritability, anxiety, keeping to himself, and insomnia.
In the question, We were told that his states is getting worse, and is concerned about memory loss of recent events which are symptoms of dementia.