I, Satyajit Guha am 29 years old. I got married before 9 months. Now my wife is almost 6 months pregnant. My wife is completely house wife and she never goes anywhere along. When I am in my office she lives in my house with my parents. My wife is pure, good & very supportable and loves me very much. I am sure that I have succeeded in satisfying her sexually and she is happy with me. But in last february18 unnecessary a bad, in logic negative thinking about my wife suddenly came in my mind and it is making me puzzled and suspect that my wife is engaged with someone till now. In-sprite of knowing that this suspect is completely unrealistic, in logic and wrong it disturbs me always. I always want to be free from such of negative thinking. But I failed for above 2 months. As a result such type of negative thinking makes me puzzled and broke my mind and also can't give attention in any work. An unstoppable condition in mind always disturbs me in any situation. So please suggest me how to be free from this problem and advice any medicine, if it is required for my mental trouble.