Find something that brings you pleasure that's not a screen. Like baking, or fishing, or going for a walk. Mindfulness is a school of thought that deals with stress. You should take a look at that. Also, try to get some perspective. If you are not dealing with heart surgery or rescuing puppies, then it's really ok if things get messed up for a while.
The biggest aspect is to not hold on to the stress after it's done. Here's a link to a Quora topic that covers this.