His message comes after it was reported that Demi was found "unconscious" in her Hollywood Hills home before she was administered Narcan and then taken to a nearby hospital.
The stark piano ballad, released with little fanfare on June 21, sees Lovato sing in brutal detail about her struggles with addiction.
Lovato previously completed a stint in rehab at age 18 for drugs, self-harm and an eating disorder before finally getting clean in 2012.
"I love [Demi Lovato] so much", tweeted Ellen DeGeneres, who has had Lovato on her show many times.
"And daddy please forgive me for the drinks I spilled on the floor".
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The star recently split with her life coach, Mike Bayer, as well as letting go several other members of her team.
"But I did it anyways, and I loved it the first time that I did it".
Lovato's Atlantic City concert planned for Thursday has been cancelled in the wake of her overdose. However, last month, she released a song called "Sober", revealing she no longer had a hold on her sobriety.
Meanwhile, Lovato's reps tell ET in a statement that she is "awake and with family".
When "Extra" caught up with Demi at an event in NYC in March 2017, she opened up about her sobriety.
In the song, Lovato also sang, "I'm sorry that I'm here again". Thank God. If I know my monsters as well as I believe I do, we all wish you self-compassion and inner peace.
On Sunday, Lovato performed at the California Mid-State Fair with Iggy Azalea.