I have such a hard time coping when everything gets loud,
I often must retreat to my own space (my bedroom) in order to avoid becoming too agitated.

What helps?

Try to focus upon what helps. You might even ask others what they find helpful when they are in your shoes? Try to keep your focus upon what DOES help, including what MIGHT help.

Sleep helps me and when I am missing sleep, my symptoms get worse and worse until I just cannot handle it. I then have to get some sleep somehow (safely, of course).

How would you end up in IP?
Would your H suggest IP?

As you know, it is best to address this asap. Do whatever you can do --safely--- to get some rest, preferably some sleep.