I dropped my Panasonic HC-V180 Camera, and now camera doesn't work?
As far as what is technically wrong with your camera; the answer is it’s busted. You dropped it. 

As far as repair, go to the Panasonic Website, navigate to support, cameras, repairs. Depending on your camera model, it will give you your options on repairing it. 

Some companies use vendors, some charge a fee up front just to accept it to determine what needs to be repaired, then quote a price for parts and labor. 

But the answer to where to get it fixed is on the Panasonic website. Youll have to mail it to a service center. Then decide if its worth repairing.