Not in anyway to sound like medical advise, but it sure seems like your body /neuro chemistry is having an adverse reaction to alcohol. maybe it's a temporary thing?
Are you sure you don't have at least a small emotional attachment to intoxication? (which in my view, phormer drunk phd) is just as if not more dangerous going forward. Maybe stick to the two beer limit, and if that proves too hard , it may be a good idea to consider just not consuming alcohol, its just one chemical among countless others and it may not 'like' your chemistry, or rather your chemistry may not like it.