My dad was just diagnosed with dementia in Feb.of this year. He is also a Parkinson patient for 17 years. He was placed in a nursing home middle Feb. somewhat coherent and lucid. His acting differently started in Nov. of last year. So it's only been six months and has had such a rapid decline in the last three. He still has his vocals but does not make sense of things and could not hold a conversation. Is confused going to the bathroom, needs a depends. He now has trouble eating with a fork and uses his hands now. He still recognizes us thank God. He has been in a psychiatric unit for week because of his irrational and argumentative behavior. He is now having electrotherapy treatment. I believe that is what it's called. So my question is this a late stage dementia? And why has it declined so quickly? Most appreciative