Get a grip! :laugh:
Seriously, though...get a better holster, and BE MORE CAREFUL with that thing. I don't care if it was in a holster or in your hand when it was dropped. YOU are the one responsible for where your firearm is, and what it's doing. Without your action, the firearm is an inert chunk of metal that does nothing. I know that most modern firearms are engineered to be safer and withstand a good deal of punishment - but frequent dropping is just negligence, and unsafe.
I doubt the internal mechanisms are damaged; think of the forces exerted and withstood each and every time you fire the thing. If the function isn't right or if you're worried - take it to a gunsmith and have it checked out. Yes, it costs...but how much is your peace of mind worth?
As for the external - you can get it re-blued, or just oil the bare spot a little extra. Those first few dents and dings on a work gun are the worst to get over. Much like the first few dents and dings in your new car.