Heck yeah stress can cause an attack!
Been there. Had measureable improvements after having relieved myself of toxic people and situations. Even more improvement (in limiting attacks) when I changed from Group Therapy with a LCSW to private sessions with a Psychologist that specializes in chronic pain patients. What we are going thru is almost unbearable. Those yet to be diagnosed have it even worse because they aren't 'believed'.
In my opinion, Psych counseling is just as important as Feldenkreis PT or stretching.