What should I do?

IF it were the USPS here is what would happen. You report injury. Your told to file a Injury Comp claim. And told to stay home until recovered. As to your pay the DOL is SUPPOSED to pay you...but they won't. So you burn up your sick/annual leave. Run out of it? No pay. Unable to return to full duty? Have a nice life....outside the USPS....Be careful what you do here...