[Divorce of One Afflicted with Obsessive Misgivings]

Answer—and Allah is the One who grants success: Such a statement is not a divorce; it is merely information about what he will say in the future. Informing about divorce is not a divorce—whether about the past or the future. However, if someone informs that he has divorced his wife, then the necessary ruling is to judge the divorce as having occurred—not because his report is itself a divorce, but because a person is held to and bound by what he admits and acknowledges upon himself.
Yes: If a person acknowledges that he divorced his wife, then claims that at the time of divorce his intellect was impaired, and he proves that with evidence, then his acknowledgment and admission of divorcing his wife in such a state is not a divorce. Thus it becomes clear to us that reporting a divorce is not, in itself, a divorce.
Source : Min Thimār al-ʿIlm wa al-Ḥikmah vol.1