10 years ago, after major, major surgery and pain meds, my husband began to decline mentally. 5 years ago I went away for 10 days and had to have someone come to stay with him (he said he was going to take a road trip by himself during that time). He got so bad I had to help him dress. This past March, when I had to have surgery, he seemed to "snap out of it" so he could take charge. There remains some long-term problems, like short term memory, motor skills, and following directions, but his mental capacity seems to have come to near normal.