Neurologist believes that my anxiety & stress is causing my myasthenia gravis to flare not that it's mg itself flaring. how is this/can it b possible?

Anxiety shows itself: In may ways. Once can mentally obsess over things that frighten the person or do behaviors to keep danger away, e.g., ritual behaviors, checking and re-checking. Physically there can be heart palpitations, shortness of breath, sweating, sleeplessness, etc. Please go to a mental health professional for support. MG is an autoimmune disorder but anxiety can magnify any symptoms.