There are several synonyms for the phrase "seized by" that can be used to describe a sudden and intense feeling or situation. One alternative is "overcome by," which suggests being overwhelmed by a particular emotion. Another synonym is "gripped by," which evokes the sense of being held or grasped tightly. "Afflicted by" is another option, indicating a negative or unpleasant condition that has taken hold. "Consumed by" is a more dramatic choice, implying complete and total absorption into a particular state or experience. Overall, there are many ways to describe feeling seized by a particular feeling or situation, each bringing its own shade of meaning and tone.