Down and depressed

I'm having a difficult time dealing with this break up.  After 29 years with this man, I feel so lost and alone.  I'm trying to move on and I know I have to but I have some really bad, overwhelming moments of despair that I feel like my world has been turned upside down.  The only wonderful thing keeping me going is my son who is my life.  I am trying to stay strong for him.  I know I can do this, but right now it seems hopeless.