Is one who says "I will disbelieve" or "I am a disbeliever" during severe obsessive whispers considered an apostate, or is that merely obsessive whispers?

These are obsessive whispers that must be ignored and not paid attention to. They do not affect the soundness of faith, and they must be disregarded and not given importance. There is no need to make up the days whose invalidity is doubted, because doubt about an act of worship after its completion has no effect.