One of the biggest pieces of advice I give students, fellow teachers and clients now is that it is ok to say no. It's that whole put your oxygen mask on first before assisting others idea.
During these past few months, I've made tough decisions of giving up classes, holding off on workshops and saying no to opportunities that were great, but just didn't work for me at the time.
It took a tremendous amount of stress off of me and helped me focus on the things that needed my immediate attention. Stress and anxiety will never cease to exist, but with practice (and the words 'no thank you') we can control the amount we let into our lives.