What is the ruling concerning the prayers performed by the questioner after reciting Al-Fatiha quickly and ignoring the doubt as to whether its recitation was completed, assuming that this was from whisperings (waswas), based on your previous fatwa?

The statement mentioned in Fatwa No. 122593 is for the person who is not afflicted by waswas (obsessive whispering). As for the one afflicted by waswas, he should disregard the whispers and pay no attention to them. Therefore, his past prayers are valid, Allah willing. He must continue to disregard the whispers, ignore them, and pay no attention to them.