So what exactly is your "in-basket." Your in-basket is the list of things you have to do. The stress of things that need to be done all the time. I think it is important to realize your basket will NEVER be empty. There is a time and place for everything and sometimes it is important to realize we need to make time for ourselves to relax. Take time to breathe, to remember how insignificant most tasks we have are. What needs to get done will get done and if it doesn't, it's a good reminder that it is not life or death.
The notes app in my phone is my life line, I am a very organized person and everything that needs to get done gets listed in my notes. Some days I glance at my list and I am overwhelmed. I get flustered because I have so much to do and not enough time to do it. This is where I have been stopping myself taking a second to realize what can be done today and what can wait. This is not an excuse to flunk your tests or slack at work, but just a thought to keep in the back of your head. Until the day you die, you will always have things that have to be done. Do not let these things burden you or your mentality. Focus on short and long term goals and then, while executing them, practice patience because most of your tasks will involve other people as well.
I don't know when everyone made life so complicated and rushed. Everyone is living in a panicked mess and when I stop and look around, I don't blame some of these people for having these meltdowns, who wouldn't?! I suggest obtaining these habits sooner rather than later. Be patient, Prioritize, & Focus on what can be done now and what can wait.