My husband was diagnosed with DLB a couple years ago, and the neuropsychologist played a crucial role in his medical diagnosis. DLB is very difficult to diagnose due to the similarity in symptoms with Alzheimer and Parkinson's diseases; therefore, I am so very grateful to our Heavenly Father for having accompanied my husband and be part of this comprehensive evaluation. Thankfully, I was able to report the symptoms I observed and prevented my husband from being misdiagnosed.
I would respectfully advise you to be open to the possibility of including a neuropsychologist as part of the medical team.