First of all

For me BFing DD3 did a lot of healing emotionally from what happened with DD2. It sounds like you did everything you could hun. Don't beat yourself up about it because it was out of your control. You stuck it out for a lot longer than a lot of women would. It sounds to me like you have everything prepared that you possibly can.

Remember that this is a whole new experience. #2 wont necessarily have the same difficulties as #1 did, and you are a strong woman. Good luck and I hope you can have that BF time that you so desire