A330 FCOM 4.05.70 Pag.25 specifically says:
MDA/MDH - Disconnect AP and fly visual or Go-Around
IMHO it is not a safe procedure to engage the AP at such a low altitude in order to go-around. Pilots are expected to be able to hand-fly the aircraft in every situation. I know that there are some airline companies that encourage their Pilots to keep AP ON and use it, as much as practicable, but the general final result is lack of proficiency and loss of self-confidence.
It is an error to engage the AP (if not previously engaged) to perform a low level go-around (even if briefed) or to continue an approach. One has to be prepared to take-over and do it manually. If you feel uncomfortable (for what ever reason) just level your wings and execute a go-around. Fly your aircraft to at least 1500' or MSA and only then (after reading your FMA and having the PNF switched the FCU to the figures you want to read on your FMA) AP may be coupled. If one feels uncomfortable with the way the approach is being hand-flown do not switch the AP ON, cause the mode or the drift out of that particular mode may surprise you at very low altitude. Remember: Aviate, Navigate, Communicate.