The phrase 'feeling spent' is correct and usable in written English.
It can be used to express a feeling of tiredness or exhaustion. For example: After working all day, I'm feeling spent and need to rest.
By the time I left for vacation three weeks ago, I was feeling spent.
I huddled in my seat, feeling spent and empty and old.
"There were times here when I was playing 45 minutes and feeling spent.
But the process of searching for work and coming up empty has also left her feeling spent.
The obvious grist that accompanies a sprint or long-distance run leaves me feeling spent just watching from the sofa, while the elegance of contracting muscles and swinging limbs of the more balletic sports is somehow energising (rictus grins aside).
Doctors say that caffeine pills can be effective to stay alert for a few hours, but large doses -- one No Doz pill contains 100 milligrams of caffeine, about as much as a cup of coffee -- can leave people feeling spent.
He returned the TV to the store and went with his "original gut feeling," spending an additional $200 for a 50-inch Sony SXRD rear-projection HDTV.
There were opportunities to direct again, but I remembered lying on the stone beach at Nice late one day, when we were close to finishing, wearing a pair of Battistoni shoes, and feeling utterly spent.
"She will emerge," he predicts, "from this period of profligacy feeling worthless, spent and remorseful, with no ego at all, and pine for just one good, stable, interesting man to marry".
I am feeling pretty spent.
I want back the time in my 20s that I spent feeling bad about feeling bad.
