There are a number of excellent websites that provide information on stress prevention and treatment. The following three websites give useful information with clear and simple explanations and great strategies that you can begin to use immediately:

http://www.mayoclinic.com/health/stress-management/MY00435

http://www.helpguide.org/mental/stress_management_relief_coping.htm

http://www.getselfhelp.co.uk/stress.htm