Has a divorce occurred if the husband intended divorce by implication, while suffering from obsessive thoughts about divorce, and he did not form the intention beforehand, and two sheikhs issued a fatwa that it did not occur?

The basic principle is that when there is a difference of opinion among muftis, the layman should act upon the opinion that he believes to be correct and in accordance with the truth. It is not permissible for him to act upon an opinion about which he has doubts. The person afflicted with obsessive doubts (waswas) who doubts a fatwa due to these doubts must disregard these suspicions. It is permissible for him to adopt the easiest of the opinions. All the doubts you mentioned in your question are mere whisperings (waswas) and do not result in divorce. Therefore, disregard them and pay no attention to them.