My father had cognition problems along with PD.
Perhaps the type of problems you have are different.

This article says with people with DLB have severe neuroleptic sensitivity reactions, so use neuroleptic drugs with caution.


2006
Guidelines for the clinical and; pathologic diagnosis of dementia with Lewy bodies (DLB):

book excerpt:

http://books.google.com/books?hl=en&...sYZXNgo4juV_KI

click on the arrow to read more pages, and click on the plus sign to make the font larger.

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This article talks about Lewy body Parkinson’s disease, so there is a syndrome that includes both, so Sinemet should help:

Improved accuracy of clinical diagnosis of Lewy body Parkinson’s disease
Andrew J. Hughes, MD FRACP;
2000

The authors studied the accuracy of clinical diagnosis of idiopathic PD (IPD) in 100 consecutive clinically diagnosed cases that came to neuropathological examination. Ninety fulfilled pathologic criteria for IPD. Ten were misdiagnosed: multiple system atrophy (six), progressive supranuclear palsy (two), post-encephalitic parkinsonism (one), and vascular parkinsonism (one). Assessment of the clinical features suggests that an accuracy of 90% may be the highest that can be expected using current diagnostic criteria.

http://www.neurology.org/cgi/content/abstract/57/8/1497