Milk Drying Up?

piedpiper07

Every day since Thursday I have had to be away from DS, due to a job process.  So I have only been nursing at night.  I returned home today and DS is very very fussy at the breast, like he is getting angry.  I don't feel any letdown like I usually do, and he is asking for food every 45 minutes or less.  While I was away during the day, I was at a very rigorous testing session each day and did not have time to pump.  Once I did manage to pump one time during the day and it looked pretty clear.

I was gone from 9am-1am. 

Is my supply dwindling? Did I just dry myself up?