Like several others posting here we talk about all emotions being okay. If you're angry, scared, stressed, happy, they're all valid emotions.
We talk about the impact of our emotions on others and how sometimes taking time out is the best way of not impacting others and respecting their emotional needs. DS1 has Autism and has become really adept at identifying when things are starting to feel overwhelming. He isolates himself and uses class passes at school to go to a safe place. Not 100% but it's amazing how identifying, owning and taking responsibility for your emotions can have a really positive impact on your life.
For me learning about adrenaline surges and how when your adrenaline reaches a certain point you're in fight or flight mode and basic animal instints kick in. Do you fight for your survival or run? Punch someone/ lock yourself in a cupboard/ run until you cant physically run anymore? It helped me Lear that when DS1 was lashing out he wasn't actually present as DS1 - he tends not to have much recollection of meltdowns. Likewise with DD she completely shuts down and goes into herself - she just needs to be kept quiet and safe with space around her and it will pass with time. She is learning self management too. A great teacher this year is working with her to allow her to sit at a table on her own when she needs space, to read a book when she cant cope with the noisy/ boisterous playground etc.
DD (7), my youngest of 3, has a social communication disorder and shuts down sometimes. She's enjoying coming up with new names for emotions. The most recent, that I love, is nervousited. It's when something is happening that you're excited about but your also nervous. Apprehensive doesn't cut the mustard because that's when you're just worried and nervous. Nervousited is a positive emotion it's when you have additional adrenaline running around in your system but in a positive way even if you're a bit scared too.
I think basic mental wellbeing should be taught in schools. Including the old mumsnet classic of comparison is the theif of joy. Look from the inside out. Respect yourself for your own strengths. Mental health often seams to be thought of as the extremes I.e. suicide risk, self harm, anorexia but for the majority a bit of education and support in self respect and emotional well being could help prevent escalation.
Stress is a perfectly normal and appropriate emotional reaction to a pending big life event. How we mitigate the effects we can all work on. For example have a good bedtime routine, rest, try to get fresh air and a bit of exercise each day, eat a balanced diet, hug our loved ones and not live in fear that any one event makes or breaks life - it can change its direction/ adjust the path you travel but after all life is a journey. Its not about reaching the destination it's about enjoying the journey with its many planned stops and unexpected twists and turns.