or agonise
■ verb
1》 undergo great mental anguish through worrying over something.
2》 [usu. as adjective agonizing ] cause agony to.
Derivatives
agonizingly adverb
Origin
C16: from Fr. agoniser or late L. agonizare , from Gk agōnizesthai 'contend', from agōn 'contest'.