What are anxiety dreams? They are dreams triggered by anxiety (worries) over current concerns in your life.
I have graduated and left school ages ago. Yet I dreamed about my school days, when I had to attend a tuition class. Sometimes, I was late for tuition because I got delayed doing something else. I preferred to study alone. In my adulthood, I chose self study over attending class for creative writing and drawing.
If I dreamed about anxiety in my night’s dream, my brain probably continued the state of mind I was in, during my day, before I fell asleep.