Your reasons for experiencing stress and ways of experiencing stress will be slightly different than everybody else's. Some people's stress will cause them to retreat into themselves, while others might become more extrovert and loud. Some people will experience migraines caused by stress, and others will get stomach aches. Some people might experience problems sleeping, while others will find they are sleeping more.
It follows that everyone will also have different ways of relaxing and overcoming stress. Try going through this book and putting together your own plan to manage and beat your stress. It will probably involve exercise and relaxation, but you can decide in what form. To become calmer, happier and healthier you will need to search for your own answers and it won't happen overnight. It will come about in steps, bit by bit. But if you could be feeling substantially better in six months time, would that be OK?
Stress is a medical condition and it can have a serious effect on your health. If you think you are suffering from stress it is crucial that you consult a medical professional.