I find myself being anxious at times. Is it common?
A little anxiety is common, but it is not clinical until present for six months.
When was it first discovered?
The disorders have been known forever.    Drugs to treat them started with Librium in 1955.
Are there any natural cures?
Kevin Trudeau claims there are natural cures "they" don't want you to know about, but there is no clinical evidence.
Didn't he go to jail for a while?
He was convicted of credit card fraud in 1990 or so.
How can people still trust him?
Who know.      That gives me worry about future events!