I can remember the exact moment where I realised it was impossible to get my wife to hospital (we'd actually just been there and they sent us home). Something flicked, and it was just "Well, this is happening." I wouldn't describe myself as calm — but I definitely knew I had a responsibility and I was just going to do it. Of course, I was on the phone to the ambulance and following instructions.
Only a month later, I remember the experience in general, but aside from the moment described above, the rest of the details are pretty hazy. Fortunately, my daughter was/is fine.