“What would cause a change in focus and balance through the day? ”

My question is about my 62-year-old husband. Over the last several months he has become changed during the day. In the morning when he rises, he is the same old person that I’ve known for 40 years. As the day progresses, he begins to lose focus, balance and becomes more obsessive. He acts as if he is drinking alcohol. I know for a fact he is not drinking any alcohol. He does however drink about 8-10 oz. of apple juice watered down with several ozs. of water. If not apple juice, he will cut oranges and drop in his water container. He does this to flavor his water. He drinks about 30+ oz a day.

My husband is in average/good health and is retired as well as I. He does take meds to control his cholesterol and blood pressure. I have asked him to contact his primary care mgr, but whenever I try to talk to him about this, he denies anything is wrong. I am very concerned about his health. This is not normal. I have looked up his meds for side effects, issues with blood pressure and blood sugars. All without answers. What could cause this change in his behavior daily?