It has been a very common thing in my life, that the list of things that I need to accomplish on any given day, will far surpass what I am capable of actually accomplishing.
At the end of the day, it's easy for me to get overwhelmed by all the things I hadn't managed to cross off the list, especially when other things that hadn't started out on my list crop up during the day and end up taking place of priority for legitimate reasons.
So, although I may have spent all day keeping busy doing things that needed to be done and having minimal break time, I may have ended up accomplishing almost nothing that was on my list at the beginning of the day.
At such times, I've found it is helpful for me to keep a list of the things I did that day, everything I did accomplish regardless of whether it was on my "To Do" list or not. Seeing my "Done" or "Did it" list at the end of the day can help me feel less like a failure, and focus on the positive-ness of having spent the day accomplishing things that were worth doing.
Worth a try for anyone who may experience some of the same anxieties about never having enough time for everything that needs to be done.