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Hello and thank you for using JustAnswer. So the good news is that these are just thoughts, not actual urges which are irresistible and would have caused you to actually crash the car. We all have thoughts about different topics because we are not in full control of our thoughts. For instance if I wrote "banana" probably a few different images and thoughts would come to your mind as a response, but not because you were in control. Also because we are not in control of our thoughts is why thoughts are not considered wrong or immoral, but actions are; so with that being said most likely you will never crash the car as you are in full control of your actions, but if you are truly concerned about these two incidents when these thoughts appeared than you can consider entering into Cognitive Behavioral Therapy (CBT). CBT has a premise that your symptoms are caused by negative thoughts, so if we change your thought process to be more positive and objective, then your symptoms will lessen as well. CBT will help you to better see the whole picture and not focus purely on the negative. Here are a few good CBT techniques you can use as examples.
So this link may help you, it contains a technique I use with patients called a thought record. It will help you keep track of any negative thoughts you have. You put the negative thought on paper, the emotion accompanying, the evidence to support it, and the evidence against it. Then I want you to come up with an alternative thought for the situation (more objective and plausible). This will help you change your way of thinking to be able to think more positive and not automatically go to a negative type of thinking.
In addition, these two worksheets are very good at helping to lessen negative type thinking. It can help you focus on the big picture and the objective/positive thoughts and outcomes.
Now if these thoughts become more intrusive and start to occur nearly every day for about a month than you may be starting to develop Obsessive Compulsive Disorder (OCD), or Pure-O, which means you only have obsessions. In this case than CBT and Exposure Response Prevention (ERP) therapy is highly recommended in addition to a SSRI antidepressant. You are definitely not there yet with a OCD diagnosis, but I just wanted to let you know what could happen if the thoughts become intrusive and you cannot get rid of them. Also even with OCD, individuals rarely act on the intrusive thoughts so at this point, you do not have anything to worry about in terms of acting on these thoughts of crashing your car as you are in full control of your actions.