A great way to lower your stress level or beat it all together, is to find an activity or hobby that you enjoy. Whether it be a reading club, gardening, or bike riding, find something that will give you a place to get away from it all, and just have fun.
Find out and target what it is that is stressing you out. If it is just your job, then think about switching careers. If it is your family, then work on the issues you have with them. Really zone in on what it is that is causing your stress and then deal with the root of the problem.