Always think ahead. This will help you a lot, it will get rid of stress and anxiety. While working under pressure might make your work better, it will stress you out. Plan ahead and set different due dates for whatever it is that you are doing to sooner dates. Like this you could still have the "under pressure" work thing, but you won´t freak out about not having it done when it should be. It is also easier to do everything at the moment assigned or asked. Leaving it for later could end up in the complete oblivion, causing later, stress.