by Fox Health

A Sheepshead Bay father was so angry when he found his heroin addict son’s stash that he shot it up himself and almost died of an overdose — just to send a message to his kid.

“I told him if you’re not going to stop, I will do the same as you do,” Sergey Gnatovskiy, 45, told The Post. “I [tried] to send him to rehab. He promised me he was going to go, and I found it again.”

But the risky life lesson seems to have worked: Son Maykl, 23, claims he’s been scared straight back to rehab after finding his dad passed out on the floor of their living room Wednesday afternoon.

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“After seeing this, I definitely want to go. I’ve been doing this since I was 15. I’m 23 now, I can’t keep doing this,” he said.

Maykl says he instantly recognized that his pop was overdosing, and used CPR and Narcan nasal spray to bring him back from the brink — something Sergey has had to do for his son on four separate occasions.

The elder Gnatovskiy says he felt back to normal the next day and doesn’t recall much of the ordeal — he remembers going to turn off the TV and then waking up with “medical people” around him.

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“My son was screaming at me, ‘Pop, Pop, are you crazy, you almost died,’” he said.

Maykl’s mom kicked the boy out of her house over his addiction as a teen, and Sergey has been trying to help him ever since, the father said.

But his boy is in trouble with this apartment complex over a fight with an ex, and now both men are at risk of eviction.

“I’m trying to kick him out of my apartment and into rehab. We’ve been notified of eviction and I need to prove he’s gone by May 31, which was yesterday, or I’m out as well,” Sergey said.

The loving dad, who originally hails from Ukraine, says he’s willing to lose everything to keep his son alive.

This article first appeared on NYPost.com.