Good that you are getting help from a therapist!
Changes are stressful and they are especially stressful when there's vagueness/unclear communication around it! That also sounds a lot like an internal communication issue in the workplace, not "just a personal fault" - and those things should be taken seriously.
We neurodivergents learn from childhood to ignore our needs and it takes a long time to relearn to trust ourselves and hear the cues our bodies and minds give to us. It sounds like you are already doing a lot, taking steps and finding new, healthier ways of being. Hopefully your workplace will also find ways to help out in that professional setting!