I completely agree that exercise helps! However, it is not always possible to go for a run. I find these feelings often come to me at work. I don’t know about others but am not always able to get away from my desk (I find a change of scenery can be helpful) or read/watch something funny (I find humor to be invaluable and have a “Laugh” board on Pinterest for this purpose), so I have found deep breathing to be helpful to calm my mind and put things in perspective.