Emotions arise in the place where your mind and body meet.
Feeling will get you closer to the truth of who you are than thinking. I cannot tell you anything that deep within you don't already know. When you have reached a certain stage of inner connectedness, you recognize the truth when you hear it. If you haven't reached that stage yet, the practice of body awareness will bring about the deepening that is necessary.
Stress is a form of suffering. Look at your body and see what stress does to the body and its functions - what it does to the heart, the circulation, the immune system, the digestive function, the liver.
An emotion is your body's reaction to your mind.
There are two levels to your pain: the pain that you create now, and the pain from the past that still lives on in your mind and body. Ceasing to create pain in the present and dissolving past pain - this is what I want to talk about now.
So give your complete attention to what you feel, and refrain from mentally labeling it. As you go into the feeling, be intensely alert. At first, it may seem like a dark and terrifying place, and when the urge to turn away from it comes, observe it but don't act on it. Keep putting your attention on the pain, keep feeling the grief, the fear, the dread, the loneliness, whatever it is. Stay alert, stay present - present with your whole Being, with every cell of your body. As you do so, you are bringing a light into this darkness. This is the flame of your consciousness.
When you go deeply into the present, gratitude arises spontaneously, even if it's just gratitude for breathing, gratitude for the aliveness that you feel in your body. Gratitude is there when you acknowledge the aliveness of the present moment.