It was a amateur mistake, and just simple carelessness, having said that, i'll begin.
Removing springs from a Dodge Caravan to to replace the bearing plates i decided, hell, take that nut off and the bearing plate will slip off, and it did....along with the rest of the assembly. Luckily it went into my chest, not a foot up, into my face. Anyway, as you can imagine it has caused some pain, but there is no visible bruise. It just hurts like crazy, especially when i try to lift, take deep breaths, or move my arms in certain positions. Is it possible that i bruised something behind the sternum? I'd prefer NOT to see a doctor if this clears up in a few days.