The former Wizards guard made the shocking revelation on "The OGs" podcast with ex-NBA stars Udonis Haslem and Mike Miller ... saying he struggled badly when his mom died of breast cancer in 2019.

"My mom was my best friend," the 33-year-old said.

"I put a gun to my head twice and a lot of people that are close to me, friends at the time didn't know."

Wall explains dealing with his mom's death was his "darkest moment," combined with a litany of injuries after signing a $170 million contract extension with the Wizards.

But, Wall chose not to pull the trigger ... 'cause he couldn't bear the thought of leaving his two sons behind.

"If I take myself away from this Earth, I'm failing my kids, like, who gon' be able to raise them," Wall said.

"I know I gotta be there for them."

Instead, the 5x NBA All-Star went to see a therapist -- which he continues to do -- and now he's advising other men who are struggling with mental health to do the same.

"If you ever feel like you in a spot where you not comfortable as a Black man, African American, or any race, no offense to that, go get help. It's okay, there's nothing wrong with that," Wall said.

"I had to figure that out or I wouldn't be here today."

Wall was the first overall pick in the 2010 NBA Draft and has spent time starring for the Wizards, Rockets, and Clippers. He averaged 18.7 points and 8.9 assists during his 11 seasons.