Hi roobow
I've managed with both of my DDs to do the bottle to breast transition. It's not for the faint hearted as you know!
Firstly, I'd second the suggestion that you also post in breast and bottle feeding as they are fab there ( you've maybe already done this)
I'm a bit different to you in that I was expressing all my DDs feeds so didn't need to build up supply. But you most definitely can get your supply back if you want, especially if your DD is having some of her feeds from the breast. I would contact one of the breastfeeding helplines if I were you about this. I got a note of them in DD2s red book so I can type them out for you if you need.
DD1 took to the breast fab and just went racing away with the breastfeeding.
DD2 was a bit more of a problem do what I did was offer her the breast at every second feed (bottle at alternate feeds). I would give her as much of a breastfeed as she would take, then offer her a bottle top up. She started to take less and less out of the top up bottle so I stopped them once she was just taking 20ml ish.
Then I did two breast, one bottle etc. till we were wholly on breast.
Throughout this I expressed after each feed whether it was breast or bottle.
Tips which I used to get both DDs onto breast were:
I fed their bottle with them sitting on my lap facing me rather than cuddled in in breastfeeding cradle position. (so she would prefer the cuddly breastfeed)
I gave the bottle milk at room temperature (do she would prefer the nice warm breast milk)
I used tommee tippee closer to nature bottles rather than the easier bottles she came home on. These meant she had to open her mouth to get the bottle in, encouraging a good latch and actually move her tongue to get the milk out (I'm sure other brands do similar, that was just what we used).
You could also try lots of skin to skin. Baby mooning etc.
Hope you get some help from that essay. DD2 has only been ebf for about a fortnight but already she is doing so well, latches on so easily and I have been feeding her in public for about a week. I fed DD1 till she was eighteen months and was so pleased I had persevered with the breastfeeding.
Of course if it doesn't work out then there is no reason at all to beat yourself up. But if you can get it sorted it is so worth it.