How do I deal with the anxiety of unpredictable freelance income?

You are good at the work itself. That is real, and no slow month erases it. The fear is not about your teaching. It is about not knowing what next month holds. That uncertainty is heavy to carry every day. You cannot make income steady by worrying about it. You can only control your effort, your reputation, and how you spend what comes in. Focus there. Do good work with the students you have. Ask them, gently, to refer others. Build a small cushion in the good months so the lean ones frighten you less. The anxiety may never fully leave a freelance life, but it can shrink. Pick one thing this week: reach out to a past family, or set aside a little money. Steady income is built one small, boring step at a time, not by solving the whole worry at once.