One problem the drug companies had to overcome was the fact that they can't advertise for diagnoses that aren't FDA prescribed. So, there has been a huge expansion of diagnoses over the last 60 years. In the 1950s there were 50-60 diagnoses recognized by the Diagnostic and Statistical Manual of Mental Disorders. The most recent count came in at over 300.
One example of a relatively new diagnosis is "Adjustment Disorder." This disorder is defined as essentially having a difficult time adjusting to a major life change. There also are categories such as "phase of life problem" and "sibling relational problem." Admittedly, these can be very painful issues. They are not mental illnesses, however.
So, what are we saying here, that the psychiatric industry are inventing illnesses to profit by..?