I watch CNN or MSNBC practically non-stop unless one of my favorite other kind of show is on,and occasionally PBS and sometimes if up in the middle of the night Democracy Now but am almost always doing other stuff like cooking or on the computer or eating when watching it, and these activities tone the reaction down. Sometimes I turn on the local news by mistake and can't stop watching it. Actually have been turning the news on a little less since my bf had the stroke a few days ago as I have been on the phone with the hospital and also it is getting boring. ZZZz. I have many t.v.'s, at least one in each room, sometimes two..I mainly watch it because I'm interested from a social science angle. Re the situations that arouse insecurity, yes, that can be difficult. I have been through it, but don't get upset so much anymore. Russia aligning more with China which was on the news yesterday and that did disturb me as it was one of my main concerns some years ago that this would happen.
The thing is, can a person do something about it or not? If I can't do anything about it, there is no reason to get upset. Does this make sense? Maybe not, but maybe kind of? For me nothing beats writing on the internet at the same time one is watching or listening to t.v. Sometimes recently I turn the sound off and just read the captions, and if I see something interesting turn the sound back on, and if the sound is on switch to a different news channel during the commercials.. Actually I like the voices of many different kinds of people communicating on these new panels, and a lot of these folks are very calm, and their voices calm me down. I do not see how not knowing information is the path to inner security. It would be more productive for me to study my own reactions and work on that. Then again, there's nothing more regenerative than silence, so not watching the news so much could be good for me. I am watching it less in the mornings.
To the op, this may sound crazy but I think a possible solution for you may be to watch the news even more until you become desensitized. Seriously. Not a bad idea. Over and out:-)