@JoeMaloney5 I agree with
@Ciley Myrus that your first port of call should be your local support team. You said a while ago that someone called you telling you you are getting a mentor. I'd say he would be the person to call immediately after a game like this and as soon as you get into the change rooms. But I wouldn't discourage you from seeking advice here. It is beneficial to you and many others.
As for the handling of the incident, a lot of good advice above. You say "As I was walking off the pitch I noticed Coach A had come back onto the pitch from behind the barrier
but because I feared for my safety I just left the area rather than approach him again. "
The bold part of the quote would have most likely come to you much earlier. Don't ignore those fears/concerns of safety. As soon as you feel that way, take action or change your normal course of action. You don't necessarily have to abandon the game as soon as you feel that way slightly but make sure what you do does not escalate the it. For example insisting on getting someone's name when they are threatening to hurt you. TBH I would have abandoned then but if you chose not to, distance yourself from it, still dismiss him and if he doesn't leave abandon.
No one will blame you if you abandon a game for reasonable safety reasons, especially if it is your safety.