Glucocorticoid resistance is cortisol resistance. It is similar to insulin resistance. Your cells become less resistant to cortisol over prolonged times of stress. It causes constant elevation in cortisol levels. There is a study that confirms Licorice can be helpful in this condition: http://www.ncbi.nlm.nih.gov/pubmed/23218403
Siberian Ginseng and Rhodiola Rosea also bind to cortisol receptor cells and exert some activity so they may help in this condition.