Generally, diseases that cause itching and tiredness, such as Rassaun, are treated with corticosteroids, so we can conclude that this will probably be the treatment indicated by Rassaun's doctor. Corticosteroids, as we know, are a class of anti-inflammatory and immunosuppressive drugs - that is, used to suppress the body's defense mechanisms, such as Rassaun's itch, for example.
When you run or do other exercises your working your cardiorespiratory system. when you work on something it gets stronger and more able to do excercises fpr a longer period of time