OK. It's good that you aren't completely alone. I'm going to pose some questions and suggestions but I don't expect answers and I'm making suggestions where your automatic response may be 'no, no. no', but you could think about them.
Does this mean that they are responsible for caring for you, getting you food, paying the bills (as in the process of doing it, not just paying for them), acting as a shield against other people? I wonder whether you are having your fears reinforced by their actions, or if they are unconsciously 'enabling' this in a way that prevents you from leaving this period of paralysis - by their actions, they're confirming to you that there's always danger from hearing a voice, interacting with anybody, never mind leaving the house?
It makes me think of how somebody remaining (or at least appears outwardly to be) calm is able to positively affect a group or individual. I don't want to trigger you, so I'll just give the example of being a first aider - being calm and ensuring they are safe even though I can see somebody has broken their leg is far better for them than running around screaming about it, because they'd then have the worry of my reaction telling them it's even worse than they thought. Could your family be unconsciously doing something on a lower level that's telling you that yes, it is right to panic/be afraid all the time now?
Could they work with you to sit whilst they make a call or as a delivery is made, so you are able to desensitise yourself to the sound and presence of others? Might having a Ring Camera help so you can observe interactions from another room if that feels too much at first?
You're clearly literate in terms of written communication and technologically, so it would be possible to do things like transcribing recordings. DP did that as a start when he was finding it very difficult to manage actual people.
What helped him the most, though, was exercise that involved going outside. He had all the physiological and emotional responses telling him to 'run away' but he was trapped indoors in the freeze response. He agreed to come outside at a very quiet time with me and when he felt the urge to run, he did. It made him feel better because his action was telling his body/mind that 'It felt scary/dangerous, so I ran away'. Which meant the adrenaline had been used up instead of flooding his system all the time with nowhere to go or hide from it, so he felt calmer (and pleased that he'd done it). Over time, he went from hiding under the duvet and still not feeling safe to relative normality where he works, travels by public transport and whilst he's not a fan of very crowded or noisy places, even those can be tolerated at times.