"under chemo" though, isn't some single shared experience. Everyone in that infusion room with you is getting some different sort of poison cocktail in a different strength. And most of the drugs are, quite literally, poison. There's at least 7 broad, very different types of chemo drugs, and subcategories under that. Also, very different total duration and frequencies of infusion. And they all may have other things going on in terms of cancer progression, other unpleasant treatments (radiation, surgical procedures, etc) going on at the same time, and so on.
Doxorubicin might be a good example. It has nicknames like "red death" and "red devil", and many unpleasant secondary side effects. Side effects that are different from other chemo drugs, including an unusually high rate of congestive heart failure.