Is it obligatory to pay expiation for an oath due to swearing by divorce in one's heart and with a tongue that moves without sound?

Divorce or حرمة (prohibition) does not occur through inner thoughts without uttering them. The divorce pronounced by a person suffering from obsessive-compulsive disorder (waswas) does not take effect if it was uttered without intention. If one doubts whether he has pronounced divorce, it does not take effect, because the original state is the continuation of the marriage. It appears that all of this is merely waswas (obsessive thoughts) and has no consequences, so you must disregard it.