Routine:

Andrew needs routine. He is very resistant to change. This may be a separate manifestation but I often think that much of his need for routine stems from his communication issues.
It must be so hard for him not really know what is going to happen. Any change of routine can bring on extreme anxiety and behavioral problems for Andrew. Vacations are very difficult for him. Andrew has a very limited diet. “Food Routines” I call it. He can eat the same lunch & dinner every day for weeks or even months without wanting change. You can list the 20 or 30 food items he will consider ingesting by type and brand (and he cannot be fooled). He is very stubborn about this. We have gone through long horrible stretches trying to force changes in his diet.

Sensory Issues: