There's this saying from where I'm from that goes thus:
"a jack of all trades will be a master of none."
We sometimes don't get what we intend to get done done because we want to get many things done at the same time. And the thing is that once you start dividing your attention on so many different things at same time you'll start losing concentration and lack of concentration will likely give room to confusion and frustration.
You are just one person and the only way for you to function at your best is to approach issues one at a time. By taking things one at a time you give yourself the opportunity to give that thing your utmost concentration and best and you have a greater chance of finishing whatever you give your utmost concentration to.
As you go through this new week, don't be in a hurry to get everything done at once. Trying to do that would result in nothing being gotten done. Create a schedule and take everything in your schedule one at a time. Don't overwork yourself, don't overburden yourself and overstretch your brain. Take things one at a time according to their level of importance and you'll see yourself doing and accomplishing more.
Have a great week!