Is the doubt concerning the continuity of prayer unanimously considered among its nullifiers?

If a worshipper doubts the number of rak'ahs, or completing the prayer, or performing some of its pillars while praying, he must perform what he doubted, then prostrate twice for forgetfulness (sujud al-sahw) before the taslim. If he doubts after finishing the prayer, he should not pay attention to it. Doubt is not given attention in three cases: if the doubt occurs after the prayer has ended, or if it is a mere delusion, or if doubts have become so frequent that the worshipper has become afflicted with obsessive whispers (waswasah).