I'm a father of two children (5,3) and I happen to be "gifted" with a high sensory processing sensitivity (SPS). We also have reason to believe that this applies to our kids, too, but not to my wife. As a consequence of this I feel a great amount of stress when my kids do things that are perfectly normal for kids of that age. This in turn occasionally leads to certain reactions on my side which I tend to regret later. It's not that I ever physically hurt my kids, but I raise my voice more than I should (without actually shouting), clench my fists while breathing heavily, take myself out of the situation by leaving the room without a word or - very rarely - physically hitting something like a pillow or a door frame.
After I've calmed down a bit, which usually happens within a minute or two, I feel the strong urge to give my kids an explanation of what just happened and that it's something about me (which I'm working on) and not about them. The relationship with my kids is quite good as far as I can tell and not only do I feel like owing them an explanation - I also think they'd want and appreciate one. Unfortunately I'm already having trouble explaining this issue to adults...
So how can I explain this rather complex psychological issue so that my kids can understand? Both of my kids are pretty smart, but of course they're still (pretty young) children... Answers that might be useful for older kids (as they will eventually get older) or not my own are also appreciated. (Since my wife is present most of the time, maybe there's also something that she can say or do, but I don't want to extend the scope of the question too much.)