Lori H. , Stress will effected your executive function in the way you describe. Very sensitive people often recognize ways to compensate or modify their life to overcome shutting down. Prayer or meditation, I have found is very helpful. People who also have same type of issues you describe have been very happy with results of improving diet, with nutrient dense, organic foods. The book "The Gift of ADHD" had alot of information you could use, to address options and resources possibly helpful. Also the book "The Sensory Smart Child" is a great resource for parents. It may sound to good to be true, but one stalk of celery a day, is like a nerve tonic. Wishing you The best.