The word agonizing is correct and usable in written English.
You can use it when you are trying to express intense and difficult pain or distress. For example, "The agonizing wait for the results of the test was unbearable."
Then came agonizing temptations to spiritual despair lasting for several years.
At this stage Williams began abusing alcohol, a problem that haunted him the rest of his life but that came about partly as a result of his attempts to self-medicate agonizing back pain caused by a congenital spinal disorder.
That island made for legend – Che agonizing all over T-shirts – and you could easily run up a Marxist account, of down-trodden peons, rapacious landlords, a "comprador" class of foreign-origin middlemen who did the American trade, plus revolutionary intelligentsia, etc.
Agonizing over this problem led to something hitherto unknown: a widespread reconception of the historical record.
Films agonizing over U.S. fields of military conflict were less conspicuous.
Here we are, ten days into "one of the worst scandals in modern history" (Buzz Bissinger), or "something … that defies words" (E. J. Dionne), and the students at Penn State are still agonizing over the damaged reputation of their former football coach.
Earlier, John McCain had called Cruz's defunding-Obamacare project a "shameful" chapter and an "agonizing odyssey," and the Houston Chronicle said it had regrets about endorsing Cruz.
The suffocating pain caused by the second and third drugs would be agonizing without the sedative effects of the first.
The political pundit and entrepreneur Armstrong Williams, a longtime friend and adviser of Carson's who is currently his business manager, remembers watching Carson "agonizing" in the greenroom, as he tried to decide whether, and how much, he should criticize the President.
Morse was a worrywart; he seemed to spend his time agonizing over things instead of actually doing them.
At this depth, the time between games is agonizing.
