A few months ago, I did a great thing - I turned off notifications for my work email on my phone and removed the icon from my home screen. When I want to check my email, I can still access it, but I don’t have to stress about incoming emails. I simply deal with them when I’m at work.
Another great improvement is checking my email only a few times a day and not leaving it open. The only downside is that when you’re working on an email that requires some action, you tend to leave it open and then get stressed by the notification icon as more emails come in. At work, we use BitBucket, and for my business, I use Trello, so I try to handle tasks there and minimize my use of email. I go through my inbox, deal with what needs to be done, and then move on.