I can’t say I’ve experienced anxiety or depression for a very long time, or needed medication so far. However, I do understand that there are people who have a very hard time with it.
I was stunned to learn about Anthony Bourdain, he obviously was struggling very hard with depression despite having an incredible job, success and wealth. It just reinforced to me the fact that fame, power and wealth are not everything, not matter what the world says.
There is also a book that explores the link between acedia (sloth) and a demon.
A small intro to the book says: “The noonday devil is the demon of acedia, the vice also known as sloth. The word “sloth”, however, can be misleading, for acedia is not laziness; in fact it can manifest as busyness or activism. Rather, acedia is a gloomy combination of weariness, sadness, and a lack of purposefulness. It robs a person of his capacity for joy and leaves him feeling empty, or void of meaning.”
The Noonday Devil: Acedia, the Unnamed Evil of Our Times, Author: Dom Jean-Charles Nault O.S.B.
It might be useful for you to read it, since it also contains ways to overcome it.
While family and friends are great to help overcome this issues, for me having Jesus is the key. I was particularly surprised by some Saints (e.g. Don Bosco) rain or shine, regardless of the amount of problems and financial difficulties, he always seemed to be joyful and happy, nothing was able to bring him down.
He was a man who experienced many trials, but who also lived a life full of gladness and joy. St. John Bosco was so happy that he could hardly contain it. “Dear friend,” he wrote to an associate, “I am a man who loves joy and who therefore wishes to see you and everybody happy. If you do as I say, you will be joyful and glad in heart.”