How do glucocorticoids help in a stress response?

Not the best drug. Considering your pituitary problems you would be much better off with another drug and or a psychologist and also consult with your endocrinologist..
Stress response. It mobilizing energy into the bloodstream from storage sites in the body, increasing cardiovascular tone and delaying long-term processes in the body that are not essential during a crisis, such as feeding, digestion, growth, and reproduction. Hope this helps. .