So the very, very first thing to learn how to do is to learn how to manage stress!!
I have repeatedly read in research articles, books and reports from doctors that about 80 percent of all medical problems are caused by stress.
If you are stressed you tend to not eat well and tend to not feel like exercising. There are fundamental changes that take place in your body as stress reactions. It is important to figure out what works for you and what does not.
You only need to do a Google search on stress management and you will find many resources to help you figure out what works for you. You can also do a guided meditation or stress management search on YouTube. The important thing is to find something that works for you and and use it.
Funny enough proper diet and exercise also play a big role in stress management. Remember to breathe and take walks, as well as eat fruits, whole grains and veggies.