Brain Vitamins

I guess there is something wrong with me lately, LOL. I keep on forgetting some things or tasks to be done. Example I am facing Facebook when suddenly I remember something that must be done using Google but when I open Google, I lost that memory of doing that thing but then comes back after three seconds. You know what I mean? I forget things to be done most of the time now.. hahaha. I don't know why but I really find it weird at the same time irritating. Now I guess I need a brain vitamin or something like food for the brain so I will not be able to forget things in a snap. Can anyone suggest what to do? What to eat? Please leave a comment. Thank you.