Keeping busy....sorta

Okay, so even when I have about a hundred things I need to be doing, I can only seem to focus on a task for 30-60 minutes at a time.  Then I need to rest.  Some days I only get one task accomplished.  At work, I need to get up and stretch my legs, then change tasks.  
I am pleased when I complete a task, but ALWAYS feel tired!  One day at a time....one day at a time.