A good way to reduce your stress is through what you ingest.
Vitamin C is THE anti stress vitamin, you can find it in great amount in fruits and vegetables like orange, kiwi, green pepper and acerola but even more in amalaki.
Also potassium is a good nutrient to counter the negative effects of stress on your body. Adding potassium-rich vegetables to your diet will reduce stress-related factors in the blood.
There are a lot of documentation about health and food, I love the book "Food as a medicine" because it's simple and have a lot of examples on how to use food to improve our health.
An easy way to ingest nutrients is with juice.
Here is a juice recipe, from this amazing book, that'll melt your stress.
The stress Melter
1/4 head lettuce outer leaves removed
1 celery stalk
Juice all ingredients together and pour over ice if desired.