Slightly Injured Myself and Would Like Some Input on How it Happened

Ok, so I did something slightly stupid tonight, but every other time I've done this I've never had a problem. I tried breaking a cucumber in half on the edge of my washing machine, and because it failed to break, the force ended up traumatizing my head. I'm so mad at myself because I was feeling really good before I did this. I already have sinus issues from mold, and the injury seemed to intensify the throbbing in the cavities behind my nose and in my jaw. I'm hoping I'll feel better when I wake up tomorrow, but am very nervous it might get worse.

Does anyone know a scientific reason for what went wrong? Other than, "Don't try that again," can anyone offer some advice on how to treat this injury? For now I'm gonna put a bag of frozen veggies on my face. Fun.