rough day?

I am sitting here at work.  I am so done right now.  My whole body is exhausted.  I can't even get up enough energy to move.  I still have 2 hours to go till i have to drive home.  Its a long one hour drive too and when i get there i have to turn around and drive another hour north to drop off my step son and drive another hour back.  My nearest down time will be around 8:30 pm tonight.  Oh God I hope I make it through till then.  I hate having so many responsibilities and feeling this way.  It makes doing things all that much harder.  I know it sounds callouse and insinsitive but with the 8 year old away for the weekend I feel like I can now get some rest.  At the same time though, I would rather not have to drop him off for the weekend.  I know he hates leaving and I would rather he didn't have to go through the whole business.  Still  I need the peace and quiet, if only for a moment.