And while I do believe that some people are misdiagnosed, extreme cases are often easy to tag.
Take my daughter for instance.
She is bipolar, but was misdiagnosed for seven years. Or let's just be truthful and say she wasn't diagnosed at all. She was a mess for most of her teenage life. We can look back at it now and see it so clearly, but at the time, she felt she was just another teen going through the motions.
Barely slept when she was manic. Days at a time. And would engage in periods of rage and craziness, throwing things, screaming, running away, self-medicating. For a long time, the medical community told us she was "acting out." Instead of seeing her as an "ill" child, we focused on her behavior.
Then, she would go through depressive modes, sleeping for 20 hours a day, unable to awaken to life, unable to communicate, sitting in her room for days at a time.
Barely graduated from high school. Finally became so manic in college that she was hospitalized.
Is there mental illness? Heck, yeah. Of course there is. With a little education, a few meds and some structure, she has come a long way. Trying to regulate the lows and highs. It's hard for her to become like us normal folks with few ups and downs. It seems boring to her. "Welcome to our world," I tell her. "It's not a rollercoaster, but it's safe."
By the way...she was at a wilderness camp for six weeks out west. Did it work the way we wanted it to? No. But she now refers to it as "the best she ever felt in her life." Of course she felt well. Forced to excercise, eat well, have structure, and talk about things, her illness stabilized. It is now, for her, the basis of comparison of how to live....she knows she must eat well, sleep well, excercise and maintain structure if she is to lead a balanced life.
By the way. If you need some convincing that mental illness exists, go to your state mental hospital and have a look around. See if you'd like to pull up your sleeping bag and have a few nights there yourself.
Regards....