He had heart valve replacement surgery in July 2011 and at first I attributed changes to medications, recovery, etc. But it's been close to a year ago and he is getting worse. He says things that don't make sense. He can't figure out how to do things he has done his entire life. A couple of days ago he couldn't remember the last 4 of his SSN. My mom is his primary caregiver but my sister and I are also caregivers. He is only 64 years old. I just don't understand how this happened so quickly. I'm honestly terrified of what is going on and have no idea what to do.