I speak from a student's point of view, not an instructor's. This experience was about four years ago.
I was genuinely scared when I got things wrong going-around off a single engine approach in a C310. I understood the correct sequence was: full power/full fine/full rich; pitch-up as you clean the aeroplane up: i.e. gear up and (while the gear is transiting) flaps up.
I hadn't twigged that the flaps should come up in stages. I was very focussed on getting the aeroplane clean as quickly as possible, so as to get some climb performance. As I reached flaps fully up, the stall warner started to sound very loudly. It needed a significant pitch down to recover flying speed. I don't remember the exact height, I guess we went around at commital height, so not very high.
I will never forget the moment, and hopefully never, ever make the same mistake again.
AA