I feel like when my 11 year old is gone even for the night, I have lost my rudder and spin around aimlessly.
Yesterday he was gone with the ex part of the day and with his Big Brother in the evening so I went to lunch with a friend, tried to see a grown up movie (but theater was packed!), did some shopping, then watched Lost (I'd never watched it so I'm late to the party but now hooked - thank goodness for Netflix).
I used to think I had to Make the Most Of my Limited Time Alone - so I put huge pressure on myself to Do Something, rather than just chill out at home. I try to just go with the flow now.