I know the feeling.
I was lucky, I got my vba2c with my third, and for me, yes, it really did help with a lot of the old feelings. I know this isn't a "cure", and it's not something that everyone can have. But just thought I'd share my experience ..
My vba2c didn't just give me the experience of a vaginal birth that I hadn't had before, but it also gave me a LOT of perspective on my c-sections.
Those first moments when my baby was placed in my arms ... it was the SAME, the feelings, the emotions. Having a vba2c did not amazingly make that moment any better. It didn't change the feelings I had for the tiny newborn placed in my arms. All the hupla about how a vaginal birth makes you "bond" better - for me, it made no difference.
I actually remember sitting there holding Sarah (my 3rd), the doctor was busy down below doing his stuff (just like a c-section! LOL) and it hit how incredibly familiar this felt. Even though my first two girls were c-section births, handed to me all wrapped up, and here I was a messy newborn straight to me, it felt the same in some way. The important way ... I can't work out how to explain it. But it made me realise it really didn't matter how she got into my arms, as long as she was there. I know, easy for me to say now ...
It also made me really appreciate what my body went through with the c-sections. When you have a c-section, there is always some idiot telling you something along the lines "lucky you, you got the easy way", and while you tell yourself that they are just full of it, I guess for me at least, some of that stuck in my head somewhere. Especially as I had pretty easy recoveries with my c-sections. Having my vba2c, very straight forward, with 2nd degree tears, and I just felt so much better than after my c-sections. Kind of made me sit up and think, yes, I DID do it hard with my first two, it is something that I should be PROUD of, it wasn't the "easy option".
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I want to have #3 eventually, and I know it will be another c/section. It is just so depressing.
The best advice I can give is take what you know, and work with it. With my vba2c, I truely expected it to end in a c-section. So I planned for it. And the week before I was due, I was so close to just scheduling, because I had my OB agreeing to everything I wanted in a c-section birth. It was my backup plan, and I think I planned that more than the vbac.
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feel devastated that I will never get to call anyone to tell them I am in labour, or to wonder 'is this it' or even to have those first skin on skin moments when they are placed on your chest.
Depending on your circumstances, if you don't medically need to schedule the c-section, DON'T. Let yourself go into labour. If everything looks good, try the labour. VBA2C can be done.
Or go straight for the c-section. Even if you have the c-section at the first sign of labour, you are still giving your baby the best amount of time inside. And even just experiencing the start of labour, it can be good for both you and baby.
If you do schedule, go really close to your due date .. you still have the time to worry "is this it???"

And treat the countdown to the date as something exciting. It's not the same, but it's still exciting in a different way. My first was scheduled, and I was up so early that morning, we were taking our last "pregnant" photos, and just being so silly - it was exciting and wonderful. The days leading up to it were divided between sheer terror (first time mum, first time ever in hospital!!!) and just amazed excitement.
Don't tell ANYONE the date, don't find out the gender, leave it all as a surprise. Ring your Mum as you leave for the hospital "The baby is coming!!!" And you still then have that so exciting phone call afterwards "It's a GIRL/BOY!!!"
Talk to your OB and midwife .. a lot of hospitals/doctors will do the skin to skin contact in the OR - place the baby straight on your chest and cover you both with a warm blanket. Newborn checks (apgars etc) can be done with baby there. Tell them your feelings. I had my OB personally guaranteeing no seperation if I had a c/s - baby to come straight to me, baby and husband would stay with me the whole time.
Think about your previous births, work out what is important to you. And fight to get what you want

For now, be nice to yourself. Let yourself be upset and grieve for you have missed. And then go and cuddle your babies a lot.