Not feeling well? That sick feeling in the pit of your stomach could be caused by the flu or it could be caused by your job. Sounds a little funny but this really is no joking matter. The amount of stress caused by the pressures of work can lead to health problems that could prove irreversible if not treated; and if changes in your lifestyle aren't made, the effects could become permanent. According to an article on webmd.com, stress can affect you physically by causing heada