Providing the model number to your question will help and expert give you a better diagnostic of your problem. If you would like to reply back to this thread with a model number included I would be more than happy to assist you. Have a nice day.
Release the door from the trolley and then run the opener to see if it is the opener or the door that is making all the noise. If it is the opener, you will need to open up the case to check the drive gears/mechanism for damage.
To really get any further than that we will need to know a model number so we can determine what type of unit you have.