Is a divorce uttered by the husband to himself in a state of extreme anger, without the intention of divorce, considered valid, knowing that he talks to himself a lot?

Uttering explicit words of divorce makes it effective, even if the husband did not intend it. However, if he uttered it without choice or awareness, such as being in extreme anger that made him lose his mind, or under the influence of obsessive thoughts or a mental illness that overwhelmed his intellect, then his divorce is not effective. If trustworthy scholars have issued a fatwa to you that his divorce is not effective, then there is no blame upon you in acting upon that fatwa, and do not pay attention to obsessive thoughts thereafter.