Emotional Hijack, not only happens on kids and teens, but also in big-kids like each of us. To get rid of that, why not try the method of “breathe in a little bit and breathe out a whole lot”?
Use "short inhalation, long and gentle exhalation" to relieve negative thoughts such as restlessness, anxiety, and annoyance etc.
For example, when inhaling, silently count 1, 2; when exhaling, silently count 3, 4, 5, 6. Repeat several times you will amazed by the effects.