I believe my son handles this pretty well. He was quite small when he was diagnosed, so he does not know life without diabetes - both a blessing and a curse.
He has just started to experience diabetes in a social context and how some (just a few) children can be cruel. Obviously that is not good for anyone, and it is heartbreaking as a parent. However, those instances are few and far between, and if it wasn't diabetes, it could easily be another subject.
As a caretaker, I feel the mental challenges too. I do not know which one of us is more challenged because we are each having a completely different experience. But as a caretaker, it can be exhausting - physically, socially, psychologically and mentally draining.
I never really thought about it before, but I think I am selective with my internal battles now. I try to remember I have a choice of how far I want to let a comment bother me or situation upset me. Maybe it is a "unique" defense mechanism called denial, but let's face it, we cannot be everywhere at once, and that includes emotionally as well.
I believe sleep is critical to doing this. Something a caretaker does not always get a lot of. So I will try to bank a lot of sleep one night a week and get to bed super early. Then my tank is full for a few days. I often run on fumes, but it is what it is. And I would not want to miss out on anything in life - especially the good stuff.
I don't really have any mantras, but I am a fan of the Boy Scout motto, which is "Do Your Best". That is something I remind my son in challenging circumstances. If we are doing our best, then we know we are giving more than 100% on most days.