You have a boatload of stuff to deal with. I can only offer a few, humble suggestions and echo others’ (such as putting your own health first; as they say on airline flights, first secure your own oxygen before you assist another.)

To save time, write a heading of few words that pertain to the symptoms you observe and want the doc to hear. Add brief examples and expound when you can. For example:
FLUCTUATING SYMPTOMS
1. Sometimes he understands things; other times is confused about the very same things.
2. Blah and so on

MARKED DECLINE IN VISUAL SPATIAL ABILITY.
1. Inconsistent ability to distinguish between letters and symbols. (? , $).
2. Missed visual cues while driving to place that should be familiar.

FAILING ABILITY TO UNDERSTAND SIMPLE WORDS IN ORAL
COMMUNICATION
1. Audiologist determined his hearing is fine.
2. I say China; he hears Egypt.

SHUFFLING GAIT AND BENT-OVER POSTURE
1. Parkinsonisms ?

Ask for the Montreal Cognitive Assessment. It takes a few minutes, but is a place to start.

Does your husband have a loss of sense of smell? If so, list it.

Does he have disturbed sleep, such as snoring or leg-twitching, or does he cry out and flail as if acting out dream? If so, list it.

Does he have involuntary movements or jerking, if so…

Any incontinence or fainting or dizziness…

I am mostly familiar with Lewy Body Disease and dementia. Fluctuations in abilities and symptoms are the rule. But in earlier posts, you mentioned he has heart trouble. I wonder about vascular causes of cognitive impairment…?

Also, is the belligerent behavior new, or has he always been that way? Note changes.

Is this doc a neurologist or geriatric specialist? If not, can you get a referral?

None of this may help at all. I am sorry for that. But am most sorry for you! Please take care of you! The oxygen mask has dropped.