@Linkat,
Since my mother died in 2014 I have been suffering from acute anxiety...Information consumption at a great scale also brought me to what I guess is to be PTSD as I see a very bleak future ahead...
Xanax doesn't help much either and I refuse to up the dosage...
As for your question, I am no expert, but I guestimate some genetic factor is to be accounted for.
On an intellectual approach some people, most of the people, are not "realists". Most are oblivious to statistics and live life with "pink glasses" which is good for your mental health but bad to prepare your future. I was not lucky enough to get my pink glasses working properly...anyhow enough with my complaining, all the best to you!