I want to know what is the atonement for a person who breaks the fast because he does not feel well and…

Answer

In the name of Allah, if he is unable to perform fasting, he has to perform a missed fasting later and there is no atonement on him. If he is able to fast even if it is with difficulty which is endurable, he has to perform a missed fasting and atone for that in addition to abstaining from the fasting invalidators for the rest of the day. The atonement for the deliberate breaking the fast is of two options: fasting two consequent months and manumit a person or feeding sixty poor people. Allah is the Guide and Knowing.