What is the ruling on one who suffers from severe thirst during the daytime in Ramadan to the extent of vomiting, dizziness, and general weakness, which compels him to drink water, while maintaining his prayers, remembrance of Allah, and recitation of the Quran?

It is permissible to break the fast in Ramadan (definition) for a sick person who fears an increase in their illness or a delay in their recovery, or who anticipates falling ill due to fasting. If fasting leads to vomiting and dizziness due to physical weakness, breaking the fast is permissible, with the obligation of making up the missed days. If one is unable to make up the days, then they must feed a poor person for each day missed. It is also permissible to break the fast for someone who has reached such a level of thirst that they fear harm or perishing, even if this occurs during Ramadan.