Hi there. Rather than stop the intrusive thoughts, just simply allow them to be there for a while… Resist the compulsions gently, for as long as you can, as often as you can, and after a while, the intrusive thoughts will go away and bother someone else, metaphorically speaking.  It is quite difficult to start with, but it does get easier, and then we are free to enjoy life again, without getting anxious about everything being okay, because it usually is.