Alzheimer's Disease with Lewy Bodies: This diagnosis is considered the most likely due to the combination of progressive dysphagia, postural tremors, and cognitive decline including memory impairment and bouts of acute confusion. The presence of visual hallucinations, which are common in Lewy Body Dementia, would further support this diagnosis, though they are not mentioned.

Vascular Dementia: Given the acute on chronic nature of some symptoms, vascular dementia could be a consideration, especially if there are risk factors for cerebrovascular disease. However, the specific combination of dysphagia, tremors, and fluctuating cognitive symptoms might be less typical.
Parkinson's Disease Dementia: This could explain the tremors and cognitive decline, but dysphagia as a prominent early symptom would be less common. The postural tremors could also be consistent with Parkinson's disease.
Frontotemporal Dementia: Although less likely given the symptom complex, frontotemporal dementia can present with a variety of cognitive and motor symptoms, including dysphagia in advanced stages and significant personality changes or language difficulties, which are not mentioned.

Creutzfeldt-Jakob Disease: This is a rapidly progressive dementia that can present with myoclonus, tremors, and significant cognitive decline, including memory loss and confusion. Dysphagia can occur, especially in later stages. It's crucial to consider this diagnosis due to its rapid progression and the need for prompt identification, despite its low likelihood.
Normal Pressure Hydrocephalus (NPH): Characterized by the triad of gait disturbance, dementia, and urinary incontinence, NPH can sometimes present with dysphagia and significant cognitive fluctuations. It's a treatable condition, making it a "do not miss" diagnosis.
Wernicke-Korsakoff Syndrome: Caused by thiamine deficiency, often due to alcohol abuse, this condition can lead to significant cognitive impairment, including confusion and memory issues, along with ataxia and ophthalmoplegia. Dysphagia might not be a primary symptom but could occur due to associated conditions.

Prion Diseases (other than Creutzfeldt-Jakob Disease): Such as Gerstmann-Sträussler-Scheinker disease or fatal familial insomnia, these are extremely rare and would typically present with a strong family history and specific symptom complexes.
Whipple's Disease: A rare, systemic bacterial infection that can cause dementia, among other symptoms. It would be an unusual cause of this specific combination of symptoms but could be considered in the differential diagnosis of dementia with unexplained systemic symptoms.
Mitochondrial Disorders: Certain mitochondrial myopathies can present with dysphagia, cognitive decline, and other neurological symptoms, but these would typically have an earlier onset and a more complex clinical picture.