Try go for a swim in the ocean, an afternoon walk in a forest, a bit of dancing (and music!) at night. Don't underestimate how much rejuvenation you can get from having various natural (mental, emotional and physical) experiences like these.
There's also an adrenal support supplement which after a few days will help recycle hormones taking the load off your system. Essential oils supplements should also help with mental clarity.
If your digestion is currently poor, then after a few days of eating less toxic food you should have much more energy and less mental fatigue.