Oh upduff I feel so sad for you.
I had a real phobia of labour before I got pregnant first time around, stemming from trauma not a million miles away from what you mention, though not in hospital. For me, counselling and lots of working through it was needed before I could even countenance getting pregnant - I'd told DH that he would need to accept we couldn't have children.
For my first pregnancy we hired an IM and tried for a homebirth as I felt v scared of being in hospital. As it happened I ended up with an emergency section after labouring at home as DS got stuck in a funny position. But I did all my labouring at home, which was really the bit I was scared about. The c/sec for me was fine.
I'm pregnant again and planning an elective section - like you, I am considered too high risk now for a midwife led unit and can't stomach the thought of labouring in a consultant led unit with all the monitoring and restrictions etc. Would an elective section feel any less invasive to you?
I think, in the most gentle voice possible, that whichever option you go for you need to have another go at working through some of this. All the options mean some loss of control and I think all of them could potentially feel like further trauma to you in your current state of mind.
Japhrimel is correct on the legal side of things. I considered an unassisted birth first time around, but DH really didn't feel comfortable with it (and tbh neither did I, I think I was just panicking at the time) and so we went for the IM.
I would investigate getting some therapy, I'd have a look around again at IMs; maybe meet with some and talk through your concerns, and have a think about how an elective would make you feel.
There IS hope. I know you don't feel that there is, but there is. There are women who feel just like you do, who come out the other side more whole and strong for it. You CAN be one of them.