Memory getting worse?

My memory has always been kinda sucky.  So I try to make notes and lists.  But sometimes I forget I have a list, or forget to look at it.  Times goes by and I remember again what I need to do.  It goes on another list.  Sometimes I look at the list but just feel really lazy and unmotivated to accomplish the task.  I'll do it tomorrow...  which turns into a week later.  Sometimes it feels like I have less brain cells.  Whatever is supposed to connect isn't connecting.  I don't feel myself.  I don't feel normal.  I don't like it.