Director Stephen Gyllenhaal may have found his next project — and it’s a topic very close to him.

Gyllenhaal — father to Oscar nominees Jake and Maggie and 10-year-old Luke — was with his youngest son at a swimming pool last year when an unusual feeling washed over him.

“My arms and legs suddenly felt as thick as elephants, and I could hardly move,” Gyllenhaal, 75, recalled to The Post. “I was really freaked out, but I kept on thinking it’s nothing, and then it got worse and worse.” 7

After three days of being unable to pee, Gyllenhaal was diagnosed with prostate cancer that had spread to a nearby lymph node.

For years, he had taken a wait-and-see attitude to his enlarged prostate and elevated prostate-specific antigen (PSA), two potential signs of the deadly cancer.

With Septe

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