"I Survived Catastrophic Thinking" , by Gus,,, it can be done, but as with all worthwhile things it takes a strong determination and lots of Practice Practice Practice,,, first you decide to stop, then you notice that it's happening, and say: STOP ~ it won't of course, so you give yourself an alternative thought, write some down, they are easier to recall that way,,, then when you finally manage to have a comforting thought, Praise YOURSELF ~! reinforce that event~~! repeat as needed,, ad infinitum,, and voila'~! you are a new person,, (just a little joking with you, to lighten the mood,, ) best wishes,, Gus