I suffer from fatigue pretty much every afternoon as well! My oncologist prescribed a drug called modafinil. It is a mild stimulant that I can take in the afternoons around three or 4 o’clock and it gives me better alertness for a couple of hours, at least. I’ve even found that as little as 1/4-1/2 a tablet works in the event the whole tablet causes “butterflies” or something like that.