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Hi, I am an American Board Certified Neurologist and I am very glad to help you with your health concerns.
There are certain neurological or inner ear issues that can cause drunk like feeling on constant basis. If there is any damage to the cerebellum part of the brain, or inner ear balancing structures called as vestibular structures, or the connections between these two like vestibulocerebellar structures then one can experience this type of drunk feeling. When he can move the head to certain position the symptom gets better implies this is most likely related to the inner ear rather than the brain however with this type of symptom he needs evaluation for both neurological and inner ear issues. If not already done then he may try to see a neurologist and an ENT doctor so that he will receive a thorough neurological and inner ear evaluation followed by certain relevant investigations like an MRI scan of the brain and a Video nystagmography etc and this approach can help in finding out the precise cause for his symptom and then treated appropriately depending upon the final precise diagnosis.
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