Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. The concept you shared here comes under broad spectrum OCD. But diagnosis of OCD depends on continuous obsessive behavior. In your case, only with this one obsession, you cannot classify this behavior as OCD. We recheck the fan switch again and again, recheck the water tap, recheck the car door is locked etc. These are normal behavior. For OCD the same behavior is to be repeated even after confirmed. and over a long period of time. To confirm whether you have OCD or not, I need to know your whole life pattern. But with the give behavior, it is normal. You might need psychological counseling and or psychotherapy. Please visit http://psychocure.webs.com for behavior modification, mental health assistance, Cognitive Behavior Therapy and other psychotherapies, etc. Hope this answers your query. Available for further clarifications. Good luck.