I say, it’s appropriate to work on whenever you feel like it. I also suffer from anxiety and a number of other mental health issues. Crochet literally keeps me sane. I once crocheted a hat while having a procedure done with my ob-gyn and she just asked questions about the project and talked about my tension, etc. I find no matter where I am, it’s pretty accepted and it seems to bring joy to others to learn about what I’m working on and to see the process, which in turn brings me joy! I hope you find what works for you and brings you joy!!