Oh, this is cool!! !
I would be so obsessed with this. The graphics and concept are really neat.
This would be really valuable for staving of a "crash", beyond managing anxiety. Possibly you could actually see precipitating factors and behavioral "flags" leading to a meltdown. This would be great information for our doctors as well as ourselves and is probably terribly interesting to researchers. Yes, I would like the calendar to have some autistic specific features. Maybe something that quickly indicates "sensory", "social" as per "triggers".
You could also take a look at mood charts for bipolar disorder, for example. A medication check would be a good idea. That would help indicate whether the medication is effective for its purpose, not causing any problems, or if, say, the medication is contributing to anxiety. Good information for client and doctor both. I'd be interested in seeing any correlation between monthly hormonal fluctuations.
I haven't read your first post yet, but this is COOL!