I thought you may find this interesting even if a bit geeky but I have had severe depression (long time ago) and used/use exercise, eating correctly and sleep to keep it at bay, you see endorphins trigger a positive feeling in the body, similar to that of morphine.  For example, the feeling that follows a run or workout is often described as "euphoric." That feeling, known as a "runner's high”. Endorphins act as analgesics, which means they diminish the perception of pain. They also act as sedatives. They are manufactured in your brain, spinal cord, and many other parts of your body and are released in response to brain chemicals called neurotransmitters. The neuron receptors endorphins are the same ones that bind some pain medicines. However, unlike with morphine, the activation of these receptors by the body's endorphins does not lead to addiction or dependence. Hope you receive this well and maybe go for nice long walk, it will certainly help you feel better... :)