MY Mac is going crazy HELP!?

PLEASE HELP ME! I was trying to take a screenshoot and forgot what i was supposed to press I thought it had something to do with 4 or f4, so i pressed something like command 4 or f4 or command alt 4/f4 or control alt f4/4, control command 4/f4... i think i might have pressed 5 or f5 accidentally but i know i pressed atleast 3 combonations using those keys and now my mac is saying literally EVERYTHING I AM DOING! and its wont shut up! Now when i try to change my volume using the volume keys its does the functions f4 or f5 does, i dont understand! i just want this thing to shut up and have my keys do the functions their supposed to! PLZ HELP!