And recommended by my pdoc; a smartphone! Yes, an iPhone, or the like can be a lifesaver. All the appointments, names, numbers, lists, alarms, reminders, etc. keep life on track. However it can be misused too and become a bigger distraction. Know when to turn it off or ignore it.
"My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand." Thich Nhat Hanh