From your question , I believe that there was no previous history of such behavioural changes .
Hence have you checked the Electolytes level Potassium (k) & Sodium (Na) in blood .
Most psychiatrists forget this basic step.
It is usual that Old age people , who may be consuming medicines for High Blodd Pressure
may have depleted thier Sodium levels which could , make Mental confusion, and such behavioural changes.
Usually eating more salt and maintaing NA level to 135 , is all that is required.
Hope this helps.
One Natural method is
Take two Ladiesfinger (Vegetable) and cut it in half and put it in a glass of water overnight. Drink the liquid after squeezing the Ladiesfinger and consume early morning for just 7 days.
You can see your Cholesterol level be of optimum.Written Jan 14, 2019