Milk supply gone?

So my baby has been EBF since day 1. He's 9 weeks and 4 days old. And the past 2 days, he's wanted to eat constantly. And never seems satisfied when he's done. I can offer him both sides, and he screams like there's nothing there. I use to be able to pump 6 oz in one session. And now it took me all day to barely get 3 oz.. am I drying up?? Why?? I wanted to breastfeed til he was at least 6 months. I'm disappointed in myself and feel like a failure...