I freeze, but it's usually at home when I get overwhelmed with anxiety or stress, or if something (like a phone call, or the topic within the call) shocks or surprises me to a point where I become too stressed to deal.
I will literally stay in one position, and usually not a comfortable or logical one, and stare at something (usually one point) for an extended period of time until I feel I can move again. I don't even know if I have ever asked about it tho (...in therapy, but I should).
I know I can also do fight or flight if necessary and in a more open situation with people around, and if I am not drowning in my own emotions or anxiety. I am sorry this happens to you, too...and yours sounds very painful. Hugs to you.