I so understand feeling of being alone (even when I am married) and obsolete.
Some days its overpowering, other days just so so.  This morning I didn't even hear the alarm go off.  That just isn't me, I'm always awake before the alarm just waiting.
Today I didn't even realize my spouse had gotten out of the bed until 20 minutes later.  That worries me.  
I need to find a reason to get out of bed, to get up and do something.  I have very few friends and I managed to irritate some of them on Facebook yesterday by clicking on something FB told me I had to.  Duh, stupid.
Just me whining again, I'll get over it.