Let's talk about reactions and the challenges others present. How about a person you intensely dislike as they haven't quite treated you kindly in the past and now that they seem to have forgotten the pain they caused, they just go about their way, creating wreckage for others. Or what about letting your baby child stay overnight for the first time at their friend’s house and dealing the intense anxiety that comes up surrounding this? The amygdala at the base of the brain, is the part that flips its lid so to speak, creating the impulsive anxious reactions in a split second. Separating emotion from rationale.
Control however, can be regained but I believe it is a trained response and one that often needs the most assistance. This belongs to the prefrontal areas, neurologists suspect, the making sense part, which can be pulled into reality, by the breath and by being conscious in the moment and really seeing and noticing what is going on. But we often forget to breath, when it's so important.
When intense emotion is triggered, these prefrontal lobes perform the risk/benefit ratio of the brain, when to attack or run....the fear/fight/flight response and how we manage this.
Again, completely natural response and nothing to be ashamed of, however, breathing through and recognising the trigger and deciding to deal with it later is often a great Emotionally Intelligent strategy.
I use journaling techniques, others may draw, some might write songs, or plan the next response. Whatever it is for you. Don't forget, there are wades of research into these very keen responses and how we manage them. Emotional Intelligence and those that use it with mastery are great inspirational leaders to watch, such as like Michelle Obama