Cluster Feeding Frustration

LO has been eating every half hour since 3pm and I am TAPPED. My boobs are flat. There's still milk coming out when I hand express but my LO is freaking out because it's obviously not coming fast enough for him. He keeps getting so worked up and then he can't even latch because he is crying so hard. This is honestly the most frustrating and devastating part of being a new mom. I feel like I am failing him when I can't satisfy his hunger. 😪😭😓 I just want to cry.