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Looking for Dementia guidance

I am just at a loss. My dad is 69 for about 2-3 years he has been mentally declining. 3 MRIs on brain no evidence of Alzheimer’s. He is getting worse and no doctor has yet to say that there is a problem. I am an only child, and yesterday he started asking me questions like he had never met me and was asking about “the girls who live at my house” meaning my 2 daughters. Something is very much wrong and my mom and I just don’t know where to go from here because the scans are clear. Some background info he was an alcoholic his whole life, father had confirmed Alzheimer’s and mother had dementia. He did start rapidly declining after his multiple Covid boosters. I’m not saying it’s a factor, it could be a coincidence, I just don’t know what to think. if anyone has any insight, I would greatly appreciate it. Yesterday was just very very emotional for me.
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1756321 tn?1547095325
I had dementia symptoms with B12 malabsorption. In my case due to autoimmune pernicious anaemia. I had severe B12 deficiency.  It took a month for my memory to start improving  after weekly B12 injections. I switched to 2000 mcg daily of sublingual (under the tongue) B12 spray which I find superior personally. I have permanent nerve damage.

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Excerpt from Livestrong - Be Aware of Alcohol's Effects on B-12 Absorption..

“Most people enjoy drinking alcohol, but even moderate amounts of alcohol consumption can have negative effects on the amount of vitamin B-12 you absorb.

Moderate-to-severe chronic alcohol consumption can have damaging effects on your stomach lining, causing a condition called atrophic gastritis, or inflammation of the stomach. When this occurs, the cells of the stomach cannot do their job of making and secreting a substance called intrinsic factor, which enhances B-12's absorption.

When intrinsic factor is negatively affect by alcohol, your body will not be able to absorb sufficient amounts of this nutrient, leading to vitamin B-12 deficiency.  

Without intrinsic factor or a diet that contains the recommended intake of vitamin B-12, the amount of vitamin B-12 found in the body is decreased. When this occurs, these signs and symptoms of a vitamin B-12 deficiency occur: fatigue, shortness of breath, tingling and numbness in the extremities, headache, dementia, disorientation, and loss of concentration and memory.

In severe cases, a vitamin B-12 deficiency by permanently damage your nerves, leading to lifelong side effects.“
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