Did you file a first report of injury incident report?
This is to protect your rights in case the injury ends up being long term, reoccurring, or permanent. You are entitled (by law) to a copy. There is a time limit, so ask if it was filed and if not, get it filed.
Contact your State Workman's Comp office. (many have helpful experts who can help you navigate the claim process).
Have you seen your own doctor?
In many states you have the right to a second opinion and to choose you own doctor. Your own doctor would not have the monetary conflict of interest that the UPS doctor has. There are rules about "doctor shopping"; so often after you have seen a second doctor the next appointment you go to determines who you choose for your ensuing appointments. UPS can still require you to see their doctor, but you still see and accept treatment from your own, and if they disagree on treatment or ability to work there is a set process to follow. You need to call your own State's workman's comp helpline.
Do you anticipate this injury lasting a long time or possibly permanent?
If so, consider retaining a good Workman's Comp attorney. Your teamster local may have an attorney on retainer that can help you free of charge, or may help you find an attorney who has dealt successfully with UPS claims.
More information here:
Read more:
http://www.browncafe.com/community/threads/work-while-injured.367265/page-2#ixzz3yJ7HMV2M