I have had two traumatic births... one was a repeat c-section at the last minute (had been planning a vbac) for a dubious, non-emergent reason. My second was my vba2c in the hospital, which was fine until near the end, i had an unwanted vag exam, freaked and asked for an epidural (after wanting a natural birth for years).
Two things helped me get through this. With the first, it was really a matter of feeling like i made the wrong decision, that i should have just waited for labor. I felt like i let my baby down, didn't have enough faith in him. A wise woman told me i could apologize to him. So i did... i apologized to him for not giving him the birth i wanted for us, for being so angry about it his first year, and i really clung to the thought that i did the best i could, given the information and support that i had at the time.
With my second baby, what helped was choosing to focus on the parts of his birth that were good. Focusing on the traumatic parts was eating me alive, so i felt the feelings i needed to feel about them (mostly anger about the vag exam everyone in the room should know i didn't want) and then choose to not let that be my primary feeling when i think back on his birth. Now, instead, i focus on way it felt to hold him (he was the first baby i got to see come out of me and go immediately on my chest) those first few minutes when he was wet and warm and sticky from vernix.
And something i have come to recently, on a broader scope, is my need to provide women with alternatives to medical care in childbirth. It outrages me what goes on across the country to women in the name of a "healthy baby" and it isn't good for woman or babies. But i feel that perhaps i am not being called to fight that fight. Instead, I am starting midwifery school soon, so that i can provide the kind of care that all women deserve.