Nickname, my anxiety is not triggered by doing work. I do a lot of experiments + reading, thinking, making theories. There are people who help me in my group and outside my group - I work in a big institute. My burnout was primarily caused (I think) by constant failed and inconclusive experiments. I failed to produce data in the long run and it killed my self-confidence. Right now I have a new project and my work flow is structured. The problem is I am terrified of falling back. Seeing a colleague cry last week reminded me of myself. I need to stay professional now.

notz, thank you for the kind words. My anxiety didn't last long - I felt fine the next morning. I am relaxed right now. The person who was crying last week didn't show up today. Oh boy, what a workplace.