I am
about this question. With a 13 and 15 yo in my house some days I feel like I am swimming in mood swing hormones. And both of mine had it since about 9yo.
Some days are definately easier than others. Most important to our survival (theirs and everyone elses) is to remember NOT to take it personally. They may feel their mood with all their being, and fling it around with such incredible passion, but it isn't about you or anything you did or even can do. Allow them space to feel what they are feeling. Hold them if they need holding. Give them space if they need that. Compassion is so important. Not engaging in a battle or getting sucked into their drama. Personally I know all too well the hell of mood swing so seeing them have to go through it is so hard.
HTH