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If he is "confused" and not acting like himself you should bring him to the Emergency Department right away-
It could be a stroke, a bleed on his brain, or an infection
While it may be related to his drinking, it could be more serious. Please do not wait as that could make things worse if there is a delay
Good luck and let me know how it goes
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And let me know what they find- they will likely do blood work and a CT scan.