Same word repeated (emphasis on excess/continuation):
Different words listed (multiple overwhelming events):
Note: Three or more items (~わ~わ~わ) can also be chained. Often followed by で to continue the sentence.
The わ~わ structure is used to emphatically list multiple events, states, or things happening one after another, conveying a sense of being overwhelmed or exasperation. It highlights that so many things are happening (often negative or surprising) that the speaker can hardly keep up. The same word or different words can be repeated with わ to create this effect.
When the same verb is repeated, it emphasizes that the action keeps happening to an excessive or surprising degree – "it just keeps ~ing and ~ing."
When different words or phrases are listed with わ, it conveys that multiple things are happening at once or piling up, creating a sense of chaos or being overwhelmed.