One idea, can you leave a note on your door asking folks to not ring your doorbell? That would help reduce that one noise trigger.

I understand your concern about protection orders yet also do encourage you to talk all this over with your T. I've used one before and didn't have to do anything face to face. You can ask your T all the questions you can come up with, might be the case that an order would actually be helpful.

Best wishes to you, I hope you'll get some safe time soon so you can rest up. I used to think I would never get through my own challenges, but bit by bit, I do, and am much less triggered.