I had these symptoms immediately after the injection for a few hours but then they stopped. DOn't know if they can continue for days.
I have recently had a second baby and opted for a 'natural' third stage. It was absolutely fine and I delivered the placenta about 20 mins after baby! It was obviously quite unusual not to have the injection as the midwives seemed quite interested in how it went. I recovered very quickly from the birth. I'm sure this happens anyway with second babies but I felt that not having the injection helped too. HTH