Eden, what I have noticed about your posting is that you ask for help and support (nothing wrong with that - that is what this place is for and you genuinely need it) and people give it as best they can. Sometimes you seem to find that helpful (such as when people offer sympathy, hugs, empathy and the like) and sometimes you don't (such as when people urge you to be honest with your treatment providers).

We are all in a bit of a catch-22 here - however posters respond to you they come from a genuine place of caring and concern. Caring because what you are going through truly sounds awful and unbearable for any human being, and concern because there is valid real-life help and support for you out there but we are actually powerless to help you to get it.
And what I have noticed about your responses to is that when people urge you to talk honestly with treatment providers who can offer you real help and support you react very angrily to them.

So the catch-22 is this: if we simply show empathy and sympathy then we are actually enabling your current status-quo. It doesn't help you in any real way at all, even if it feels better for you in the moment. On the other hand, if we urge you to do the things that will truly help change your current situation you react with anger and dismissal. My guess is that strongly activates your fear.

You are a human being who is in genuine torment, and it is painful for others to watch you suffer through this (though I realise it is nowhere near as painful for you, who is living it moment by moment, every day). There are people who can help you get out of this torment. They are the psychiatrists and other treatment providers who - at the heart of it - are simply other human beings who help people.
They are there. They are more than willing to help you. See if you can let them.

So to answer your questions:
1. No, I don't think you need to be afraid of your psychiatrist, even though you probably will be, simply because what you are going through seems to be terrifying. But I do believe that the psychiatrist will be a safe person who will use all of his or her training and experience to offer you the best help and support possible to ease your suffering.

2. There is a possibility that hospital treatment might be required, BUT if you are willing to try whatever treatment is suggested to you it likely will not be necessary at all. The trick is in being open and willing to give the treatment a go. And at this point you don't have anything to lose. You say yourself nothing else has worked, and if the treatment offered has worked for other people in the same situation as you then it seems at least to be worth a go. You would still have the power and control to stop it at any time if you didn't like it.