I had this as well... it's not a particularly nice thing to witness. Two weeks after the birth is very early (not that I'm much further along - only five weeks) and I have also found that some of the images/procedures from the birth are still replaying in my head, although it's starting to get a bit better.
One thing I have found that helps is, whenever one of the horrible bits of the birth starts replaying, is to try and remember one of the good bits - feeling the baby hit my chest, listening to my DH talking to him, one of the doctors telling me I'd done well.
A few weeks on I am feeling less shocked by it all and a lot happier about the fact that I had a healthy baby and got through birth. I had not heard of birth flashbacks before I had a baby but I can see now why women are traumatised by birth. Mine was not even a particularly bad one, although I did have forceps and tearing, and a lot of strangers in the room at the end, as well as students who I wasn't even introduced to 
I also found it helpful to talk over the birth with my partner, who saw it all, and tell him I felt upset by some of what happened. It was all done for the best reasons but it is still very emotionally and physically tough, and you are at your most vulnerable. But it gets better after a few weeks. Just feel proud of what you did.
Congratulations on your new baby.