Hi kindhearted,
I'm sorry things sound so hard for you right now, I know thoughts like that can just snowball and completely take you over. But could you write down some of those thoughts and think about reasons which may invalidate/discredit them or alternative scenarios. Sometimes writing things down can give you that little bit more space for objectivity, or to "let go" of them.
Maybe even think about what you'd say to a friend if they said they were worried about x, y, or z happening............your response to them about possible outcomes might be a lot more positive than the way your thoughts are taking you??
And if you're more focused in general on things that have gone wrong for you??? Maybe time to really focus on/notice/recognize all the things that have gone/go right for you??? Maybe that will give you a more balanced view of how often things might go wrong/right???
Then, can you think of any reasons for the thoughts to keep going around e.g. anxiety.......self esteem issues......trust issues.........??? Because that as well might be a starting point by trying to work on some of them.
And maybe if you can learn to pinpoint the thoughts as they're taking over you might be able to "step in" there with.........deep breathing.........a mantra..........relaxation technique........mindfulness...........a "STOP"............whatever might work for you.
Sometimes allowing those thoughts to happen, accepting but challenging them can work, sometimes just breaking the thought process can work...........trail and error sometimes.
I know it can be hard moving away from thoughts like that because sometimes they can become almost automatic..........but hang in there and step by step to find things that may help a little more and a little more.............

Alison