C Section Question

Hi guys, I had my first c section on Saturday and I am having some pain that I was hoping someone could help me understand. It's in my central stomach and it feels like someone punched me in the gut really hard. It hurts so bad sometimes that the percocet they give me won't even touch the pain. When I was in the hospital and describing the pain, it didn't sound familiar to any of the nurses. Has anyone had experience with this kind of pain? Thanks in advance.