Actually no amount of chocolate will make the stress to go away.
If you are stressed by your job, environment, family or in other disturbing phases, you need to take a break and set away 5-10 minutes to come down and listen to your body. If done regularly, you will avoid stress and enjoy all the wonderful feelings you had certainly in earlier times.
The keyword is MOTIVATION.
Start to enjoy little things and breath slowly and regularly. Feel your body!
After an overwhelming day this is your medicine to bring you down and back to joy.