3. Is morning sickness dysregulation of the gut nervous system? And to avoid that, do we just have to keep doing this exercise, or is there anything else?

In general I would say no. Morning sickness is a normal part of pregnancy that happens because of the changes in hormone production, though it is possible that unresolved trauma could make this more intense, or last longer. Because morning sickness is very normal, I’m not sure this exercise will have an effect or not, but continuing with all the other program work to get greater regulation on board should help in general.