05/17/2014 at 07:55 PM EDT
's ex-husband, Deryck Whibley
, has gone public about his battle with alcohol addiction in a candid post on his website that prompted Lavigne to Tweet her support.
The Sum 41 singer warned fans about the dangers of drinking in a post titled
"Rock Bottom" on Friday that was accompanied by some shocking photos.
In the post Whibley explained to fans that he was in the hospital for a month after being sick for a few weeks leading up to that. "The reason I got so sick is from all the hard boozing I've been doing over the years. It finally caught up to me," he explained.
"I was drinking hard every day. Until one night. I was sitting at home, poured myself another drink around midnight and was about to watch a movie when all of a sudden I didn't feel so good. I then collapsed to the ground unconscious."
The 34-year-old ended up in the hospital in the intensive care unit, where he was completely sedated for the first week. When he finally woke up, "I had no idea where I was," he wrote. "I was so freaked out. My liver and kidneys collapsed on me. Needless to say it scared me straight. I finally realized I can't drink anymore. If I have one drink the docs say I will die."
The singer, who divorced Lavigne
in 2009, warned fans to always drink responsibly. "I didn't, and look where that got me," he wrote.
Lavigne, who's now married to
Nickelback's Chad Kroeger, Tweeted
on Saturday that she had spoken to her ex. "I am so proud of him," she wrote. "He is family to me and always will be. #StayStrongDeryck"