I struggle with a lot of sounds, having a sensory processing disorder, the list of which is far too long to write out here. So I totally understand the frustration and how rage inducing it is, you are definitely not alone. Especially when people don't understand it's not a patience issue, it's a 'my brain isn't wired the same way as yours and it genuinely cannot be fixed' issue.
Other people have mentioned therapy, which is definitely a good idea. They can help you find ways to channel the energy into something else, or help you find the root cause (if it's a children-specific thing, and not just a general sensory issue), or teach you good cognitive behavioral therapy practices.
In the interim, since finding a good therapist for you can take a lot of time, I would definitely recommend some form of earplugs. Mine have saved me and my sanity so so so many times. If I can recommend a particular pair, I would suggest the Loop Switch, since they let you adjust the sound reduction levels on the fly - but any brand / even the foam tip ones (as long as they fit you properly!) can help immeasurably. For me, just knowing I have earplugs with me helps dealing with these sounds, even if I don't wind up using them, just knowing the option is there. Some form of stress ball or those grip / forearm strengtheners might also be of use for you? It can be a good distraction, as well as allowing yourself to let off some of the steam in a relatively healthy and inconspicuous manner.
And kudos for knowing this is a problem for you, and looking for help on how to improve it. I hope you're able to make progress you want, one way or another. Good luck, OP - we're rooting for you
The script is ~55k characters long, depending on the source. This transcript, 55k, includes who is saying the line, as well as descriptive elements of the story, so the actual 'words only' version will be a bit shorter. This one is 99k and includes even more description of the visual elements. From what I've seen, though, most of transcripts have these non verbal inclusions, so the person who added it to the special instructions likely copied those over as well.
I can't speak to the other points, but allowing 55k characters is definitely wild.