Intrusive thoughts are really bad and take over a life. Have you read a book called Emotional hijacking by Marlene Schnieder Potter? Its written very simply and has within it very easy to follow ideas on how to overcome such thoughts and feelings. I think you can get it on Amazon but not sure.
I think its a question of remembering that we have 75,000 thoughts a day and these are just the ones which recur in our minds. I think that good therapy can help with these and answer why you are getting them. I think its an idea to try to come up with a way of training the brain to listen to all the other thoughts more. I get them and I am making my mind retrain itself to listen to the other thoughts more.