I think i broke my 5th metacarpal. how can i be sure without going to the hospital?

Urgent care: Most urgent care centers have xray machines and the ability to get you in and out pretty quickly and at reasonable expense.

Metacarpal fracture: Other than pain, tenderness, and deformity, if you try to make a fist and your fingers scissor over each other, that is one sign of metacarpal fracture but the best way is to obtain and x-ray.