Well you're asking the right questions I think. I noticed your question hadn't been responded to so I want you to at least know that someone sees and understands. Feeling out of control like that must have also been a bit scary, at least it would have been for me. Maybe if it was a first time thing it might not happen again, hopefully. But if it were to, I don't know what to say of what to do. Maybe that would be good to bring up next session? I hope someone else here has some ideas for you.