I am not the most expert physio here, but I would say you don't need a surgical operation for that, usually surgical operation are just for complete rupture or very unstable ACL.
Did you knee swell a lot and in a matter of few minutes/hour at the momemnt of the injury you had? Do you feel now that your knee is unstable and literally gives the way (almost you fall on the floor) Does it lock at all?

Sounds very strange that they didn't have a look to your ACL during the arthroscopy, if there was something wrong with it they would have mentioned it.

Don't worry too much about the clicking and noisy sound coming from the knee, almost certainly are not due to ACL problem.

All the best

Emanuele