Is the Hajj considered valid for someone who suffers from obsessive-compulsive whispers that include insulting the Divine Being, the Messenger, and the creed, especially if these whispers overcome the person in the Mashar of Arafat, and is he considered sinful for that?

You are not sinful, and there is nothing against you. Your argument is sound, and these whispers and thoughts will not harm you as long as you dislike and are repelled by them. In fact, your dislike of them is proof of the sincerity of your faith. So, continue striving against them, turning away from them, and ignoring them. You will be rewarded for your efforts to get rid of them.