More than likely, your trigger return spring needs to be replaced. They should be replaced every 5k, although like all things, they could break sooner.
There is another spring that pushed the trigger bar up to be in contact with the nternals. However, if manually pushing the trigger forward allowed you to shoot the gun again - then it's the trigger return spring.
Go here and watch this video on how to take things apart to get to the level of repairing thats pring. You will have to remove a few parts before you can replace the trigger spring.
FREE Beretta 92FS Disassembly Guide - Please Donate