My husband accidentally said the 3rd divorce as I did not answer his phone and deeply regretted it. He felt that he was possessed during this, or had an out of body experience. Is the divorce valid?
When a husband utters Talaq in the state of extreme anger but it does not reach insanity and he was aware of what he was saying then Talaq will occur.
So in this case his third Talaq will occur and the wife will be Haram for him until she marries someone else, consummate the marriage and gets a divorce.
The above statement will not be taken into consideration as it is useless giving excuses of his anger and regretting his actions.
Know, that Talaq issues are sensitive matters. It is better for one to honestly present his case to his local Mufti directly to obtain a ruling on his matter.
الثالث أن يكون الغضب وسطا بين الحالتين بأن يشتد ويخرج عن عادته ولكن لا يكون كالمجنون الذي لايقصد ما يقول ولا يعلمه والجمهور علي أن القسم الثالث يقع به الطلاق
(كتاب الفقه علي المذاهب الاربعة ٤/٢٩٤)