My husband and I have been married for 23 years. He's a loving and soft spoken person. He's always been the "smart one", very intelligent and great sense of humor. Lately, for the past few months, I've noticed some odd changes in him. He's sometimes withdrawn, and when he does talk, he sometimes repeats the same thing as if he didn't realize he had just said it. The other day we were going to our son's house just 2 miles away, but my husband couldn't remember how to get there. When I talk to him about it, he gets very defensive, says I'm the one who's playing games with him. I've also noticed that his short term memory seems to slip more than usual, like forgetting where he parked the car or that his sister had called him a few days ago. I'm very worried, I don't know what to do. I've be reading stuff on the internet like http://www.curiosityaroused.com/health/10-causes-of-short-term-memory-loss/ or http://www.medicalnewstoday.com/articles/142214.php and its got me really scared. What should I do?