lost my supply!

I think my supply is diminishing Day by day. He is constantly at my breast every hr-hr30 mins for feeding during the day. My breast used to swell feeling full when it was almost his feeding time but now they don't. They feel soft to touch and even sagging a bit. (Which I'm overly depressed about) I would massage my breast and pinch the nipple to see if milk comes out before each feeding because I'm scared I'm just pacifying instead of feeding.