Hi Kshiti,
I sometimes get worrying thoughts, but nothing as intrusive as what you experience. When I do though, the little man at the door to my mind says, “STOP, you cannot enter.” It often works, but requires perseverance. There is a website by a man who studied the ancient Hawaiian Huna techniques, and came up with his own modification which he professes will alleviate physical pain. His name is Serge Kahili King. He has a video on the web where he demonstrates the technique, which is quite simple. I have never used it to relieve pain, but I have used it to stop intrusive thoughts, and it works for me. I use only the verbal part of the method which goes like: “I have a problem. My problem is that I’m unable to (enter what you want here, perhaps, ‘my problem is that I’m unable to stop destructive thoughts’ be as precise as you can); but this can change. I want these thoughts to GO AWAY” Just these four sentences, and keep repeating them. There are also several website which profess scripts that one can use for the same purpose, for example, repeating “I am safe and at peace.” perhaps one of those would be helpful.
I hope you find your way though this nightmare.
….. john