Stress handling capacity i. e. resilience is to be gradually developed. Nil stress leads to idleness and full stress leads to decresed or affected performance. Optimal stress leads to optimal creativity without ill effects. How one knows optimal stress..? Stress which can be handled or managed efficiently is optimal stress. Stress is part of life...it should be managed. Easy fatiguability, bodyaches, muscle tension etc. could be symptoms of depression and anxiety problems. These problems are hundred percent treatable. Do consult a psychiatrist, who will guide you about medications and counseling.