にとりつかれて

be possessed by

→ に
phrase Rare #38,414
be possessed by Usually means being haunted, plagued, or obsessed by something. It can refer literally to possession by a spirit or figuratively to being consumed by an ambition, anxiety, or other condition.
JA: 彼女は将来への不安にとりつかれている。
EN: She is plagued by anxiety about the future.

やはりにとりつかれていた

So it really was possessed by a bug after all.

— 風の谷のナウシカ (1984)

彼は貧乏にとりつかれていた

He was haunted by poverty.

製作者不安にとりつかれて拝謁せよ・・・結婚は

The creator, consumed by anxiety, ordered me to come and pay my respects… What about marriage?

— 8 1/2 (1963)

彼は世界に君臨しようという野望にとりつかれている

He is obsessed with the ambition of ruling the world.