Things are about to get pretty dark for a second.
While many people suffer from mental illness, only a small percentage seek help, are on the right medications for them, or are even diagnosed. In the United States especially there are a lot of issues with how depression and anxiety are perceived, shamed and misunderstood. If your friend is suffering from depression, don't tell them to go to soul cycle and take a bubble bath. "Self care" isn't the cure for mental illness, it's just a temporary fix like ice cream and a broken heart in a rom-com.