What do you do when you have lethargy?

In January I had surgery to remove a cancerous tumor from my kidney. The recovery went well, but now I am feeling like crap. I need to push through and finish this workday (no choice I am out of town).

I have in the past went to my artscroll Tehillim and Aryeh Kaplan’s “Shabbat” to lift my spirits. Weakness and nausea are draining my energy and probably going to ruin my Shabbat.

Any suggestion for lifting midrashim or tanach portions would be appreciated.,