EHi Laura,
As a woman with SWCAH, I don’t think it was ever a question of whether I could "deal" with stress-- we’re very resilient kids--but more like I may have been more sensitive? I can go back now and recognize times when I wasn’t under good control and was obviously more sensitive and emotional. (But, that may just be me.)
I think it’s hardest when kids are young because you’re adjusting doses every few months and it can be a little bit of a rollercoaster. It’s probably not good to constantly coddle a child because he/she is sensitive, but it may help to recognize that they may, at times, react more emotionally to stress than other kids.
Anyway, this is just my 2 cents. Hope everything works out for you.