Anxious, I could be you. I also had an elective CS and was worried sick about everything you have said here, and more. I think you've been very brave and taken an excellent first step in telling your midwife. I told mine and she was absolutely lovely - and like you, I wanted to be on my own for the CS, but she actually came in as my birth partner and arranged for her lovely colleague to be there as midwife.
From my experience, I needed to feel on as much control as I could. I too was worried (to the point of panic attacks ) about being on the table, and while it wasn't great, because my midwife and explained the situation to the consultant etc , it was a little easier than I feared . And re the catheter, the midwife did that in my private room so I felt a bit more comfortable.
I think what definitely made it easier for me was having her there talking me through absolutely everything, in minute detail. It was so different to my first DD when I had horrendous flashbacks, became absolutely hysterical and then suffered PND as a result.
I don't want to go on too much , but just wanted to say that you're not alone , and that I know it's really hard to put your trust in people after such a horrific experience, but if you can try to - then things may be a little easier for you.
Please feel free to PM me if you have specific worries, and I wish you all the best 