Psychiatry IS medicine. A psychiatrist is a medical doctor, must have an M.D. first, then specialize in psychiatry. Some (many?) so-called mental health conditions are caused by lifestyles vastly different than those under which we evolved, granted. Let's exclude them.
Chronic depression is terrible. I was less than 40 years old when my husband, my father, and my little baby died. I cried every day, for two years, no end in sight. I didn't remember to eat, comb my hair, brush my teeth, change clothes. I'd wander around my neighborhood in my nightgown, giving what little money I had to anyone who was homeless, because it was the only thing, their smiles, that relieved the sorrow for a tiny moment. Finally, I went to a psychiatrist. Treatment wasn't tranquilizers (Valium), anti-psychotics or stimulants. The very first anti-depressant the doctor prescribed started to help after about three weeks. No side effects, just that I had to take it at the same time each day, else I got a headache. We titrated the dose to the minimum level necessary to be effective. No brain biopsies or blood tests were necessary. Then I asked for the generic version, as it is a lot cheaper.
I still cry a lot, but I remember to eat and sleep. I got a used Toshiba Satellite laptop for $50, learned CSS and some Web 2.0 stuff, re-learned SAS, SPSS and some Fortran. I got a job (only part-time was available) working from home, which paid more than enough to cover rent and food for me and my mother. It was contract work, so I'm looking again, but I think I can find something. I doubt any of this would be possible without the psychiatrist and anti-depressant medication.
There are plenty of whiny, self-indulgent malingerer's in this world. Lots of attention-seekers too. One could certainly argue that they have problems! But they are not of the sort that require medication, or care of a psychiatrist. I will be happy when I don't need medication or care either.