If you can try to keep in mind that because of all the bureaucratic hoops these kinds of agencies have to go through, they have rules about paperwork, etc. that are probably tied to funding. They aren't meaning to be cold and insensitive, but the system does set that environment up. IT'S NOT PERSONAL. They aren't setting out to make your life miserable; quite the opposite actually. You use words like demeaned, diminished, intimidated, degraded, etc. that indicate this whole process is very triggering to you. Try to just get through the administrative baloney with the attitude that this is just the routine, the necessary evil. You will get beyond this point and hopefully the nurses will be of help to you.
So sorry this is process is so triggering for you.
I can relate a little bit. When I am admitted to the hospital, there is a ton of paperwork that has to be completed before I can even go to my room. Interviews with the nurses, the social worker, the medical doctor, etc. It literally takes hours. A few times I've been really impatient with the process because it was very late at night and I just wanted to go to my bed and rest. But most of the time, since I know the routine so well, I just try to take it in stride as the necessary evils of getting admitted into a psych unit. Every patient goes through the same process. It has to be that way in order to complete records, provide for my care, and obviously to be sure everything is billed correctly (grr - wish they'd bill someone else

). There are reasons why everything has to be done they way it is done (even if we don't understand those reasons). I just can't let that get to me. I have enough issues as it is.
Take a few deep breaths and remember what they are doing is not a comment on who you are as a person.