OP I understand you. In my three decades of living, I can count on one hand how many happy birth stories I've heard. But the number of horrific accounts exceed count, and some of them I have heard very many times.
I'm prepared for anything, having researched everything. But, am going in with an optimistic attitude, fuelled by my hypnobirthing practice knowing full well I might have a traumatic outcome on the day. But that's not something I can control for, except to relax NOW -and rest well NOW.
I am 33 weeks with first baby. I am truly relaxed, not because I'm going in under an illusion that hypnobirthing will magically give me a zen birth, but rather that anything could happen, and I'll be ready with all my heart, I am resting well, sleeping well, and have left it to the future to enfold itself.
There's one thing more I am doing consciously though. After having read and researched loads about difficulties in labour, in these final weeks I have consciously started avoiding discussions of negative birth experiences. They are not for me at this specific moment in time. They are not giving me new information, and I am not the right person to offer the kind of support that is needed in response to these stories, at this moment. Not burying my head in the sand, but I do get to choose what I listen to and read in this last lap.
There are loads of positive stories around, they don't necessarily get told. You will find this is is a very very emotive topic,even asking to hear positive stories might trigger emotions in ways that you never intended. I have stopped asking for any stories at all.
If you join the hypnobirthing group on Facebook you will read many lovely birth stories including ones involving preterm labour, interventions etc and it will give you a nice insight into how any paths can lead to a happy outcome. Also read the birth stories in Ina. May's guide to chikdbirth.
And it's really okay in the final stretch to focus inwards, within yourself and choose to do your research into all outcomes but not get drawn into reading accounts which will impact your emotional state before your give birth. Quite different from burying your head in the sand, as I have explained here hopefully :)