TMZ broke the story ... French was rushed to the hospital last month with an undisclosed illness ... with symptoms that included severe stomach pain and an elevated heart rate. He believes the problems surfaced as a result of seriously overworking.
Doctors have ordered French to bed rest for 30 days. He's allowed to grab some grub, but no working, traveling, exercising, performing or partying ... though, since his new album, "Montana," just dropped.
What's unclear ... if doctors eventually got to the bottom of what caused the elevated heart rate, stomach pain and other problems French experienced that landed him in ICU.