Anxiety is powered by adrenaline to help with the flight response, but so too is excitement. In some instances, (but not all), anxiety is a misinterpretation of that burst of adrenaline. We may in fact have been experiencing thrilling, life-affirming excitement instead.
But if we’re not sure why we’ve felt a burst of adrenalin, and have no reason to feel excited, it seems natural enough to interpret the feeling as anxiety.
It’s possible that your mind is preparing you for change. And change, as you can imagine, is potentially exciting. Change can also be anxiety-inducing if you’re uncertain or it’s unknown where that change might lead you. In a way, anxiety is a bi-product of our lives not being predictable and pre-determined.
If we knew in advance about every event that was going to happen throughout our lives, there’d be no nourishment for our anxiety.