My husband had some signs, after a virus attacked his heart in 2007 but pretty well returned to normal. In September he got dog bit by. It got infected and he had to have surgery. He has walked 2 miles for 44 years, well at first he jogged - at 74 he walks. Not being able to walk seemed to affect his mind, although he rode an indoor bike. He occasionally stops at green lights, he talks to himself while walking, his short term memory is nearing 50% gone, he buys 2 of almost everything, he's excellent at math problems doing them mentally, now I do them faster than he does and I am lousy at math, on and on. He will not go to a doctor about this, absolutely Not!!!