I actually have what you would call ADHD and dealt with what you would call depression and anxiety many times in my life, like everyone else, I don't say that the symptoms are not real, but they are not caused by a "condition" like a real disease.
I have a problem with the label, these are nothing but symptoms of you not living according to your desires, wishes, purpose. They are not inherent diseases of the mind/brain, like cancer is of the body. And realising that actually frees you of the symptoms too.
If most people would get in shape, stop being a piece of shit loser, get rich, have a lot of sex and live a fulfilling (in your own terms) life their so called mental "conditions" would be eradicated.
Having anxiety is a very privileged 1st world issue, the same with depression and if you would actually get out of your bubble and interact with people from really rough environments you would quickly realise this.
Anxiety is a symptom of inaction 99% of the time, it s ok to be depressed by bad events going on or by being a low status loser who got nothing going for himself - it s almost like your body and mind are telling you that you are not DOING WELL ENOUGH.
You can play a game with yourself if you don't believe me all the new age mental conditions are nothing but symptoms of a shitty living experience and not actual brain disorders. You have anxiety, adhd depression? If you won 100 mil tomorrow would you still have those? Probably not, no bills anymore, kids are set, no more work, vacation any time, no more worrying, fun stuff to do 24/7, traveling, passions, fucking around, hot girlfriends, the list go on.
I did not win the lottery but I can tell from experience when I was making 1-3k a day doing jack shit on the internet and fucking around with girls all day, partying and "living the life" all my adhd symptoms and anxiety completely disappeared.