Noun, Suru verb, Intransitive verb
tossing oneself about in great pain; writhing in agony
Yojijukugo (four character compound)
週末に胆石が動いて、七転八倒の苦しみを味わったよ。I spent the weekend writhing in agony when my gallstone started to move.
Also written 七顛八倒【しちてんばっとう】、七顚八倒【しちてんばっとう】