So the neurologist diagnosed my dad with vascular dementia but my dad has never got strokes he has good health ...but he has schizophrenia and psychosis. Lately he doesn't want to take his meds or eat or drink water and he has memory problems and he is having hallucinations. I know psychosis and schizophrenia causes hallucinations! I'm not really sure if he got diagnosed right?
Think of the unfair advantages the neurologist has:
your father's complete medical and psychiatric history
access to diagnostic equipment like MRI and CT scanners
a complete record of your father's medications
AND
he's met your Dad.
So, really, the only point we have on our side is that we might agree with you and have lots of anecdotal evidence of neurologists' incompetence?
If your father has been treated long-term for schizophrenia he may be more vulnerable to degenerative brain disease, and for all I know that might well include vascular dementia.
But never mind us guessing. If you have questions about your father's diagnosis and his neurologist's rationale, there is only one person it is at all sensible to ask - go back to the neurologist. If you still don't get a satisfactory explanation you can always ask for a second opinion, only get it from a qualified practitioner.
As the others have said, a neurologist is the best one to make the diagnosis.
You are right to question this. We on Forum are the wrong ones to ask, however. We would at best be making some sort of wild guess even if we were trained professionals.
You do need to speak with the MD. If he doesn't have time to speak with the POA in health care then you need to find an MD who does have that time. I am so sorry for all you are dealing with and wish you the best.
My mom had a couple of TIAs that I witnessed so she was referred to a neurologist who treated her to prevent stroke. and as far as I know she never had one. But according to her family doctor her MRI "lit up like a Christmas tree" - she had probably been having silent TIAs for years without any noticeable physical or mental effects. Try looking up multi infarct dementia.