Belly button hurts when i bend forward or use the bathroom it feels like a tug from inside.the pain is unbareable what is it and why is it happening?

Belly-button pain: Belly-button (umbilical) pain may originate locally due to infection or herniation, or be "referred" from another abdominal location like the appendix. Signs/symptoms of concern include: local redness ; drainage, umbilical bulging that can't be reduced with gentle pressure, fever, vomiting, change in bowels, generalized abdominal tenderness (suggests peritonitis), worsening pain. Get checked.