I just bumped my head on something pretty hard.i didnt bleed too bad, but now im hearing a clicking sound..?

Normally I would say that what you hear is just the throbbing sound from the hit. Not unusual if you had a major hit on the head. Put ice on it. That will make the swelling go down and it should make the throbbing go away too. If you still hear it even after you ice it down, then I don't know what it is/could be more serious. If you have a skull fracture, the pain will get worse, no matter what you do. If that happens, go to a Dr.