What is the ruling on the prayer of one who did not prostrate on the ground for fear of dizziness, and is his prayer valid, or must he repeat it, and what should he do if this recurs?

Prostration is waived due to incapacitation. Thus, whoever experiences dizziness, or strongly believes that they will fall if they prostrate, should gesture for prostration while sitting. The prayer in this state is valid, and there is no need to repeat it, as strong presumption has a role in acts of worship.