Learn how to say Agonize correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word agonize:
undergo great mental anguish through worrying about something:
I didn’t agonize over the problem
[with object] cause mental anguish to:
a question which will agonize the technocrats
late 16th century: from French agoniser or late Latin agonizare, from Greek agōnizesthai ‘contend’, from agōn ‘contest’