A brother is asking if a person has a condition where if he fasts he gets sick and it causes him to not be able to fast for more than one or two days in a row and he needs to take one or more days of break between each day of fast, what should he do when missed fasts get accumulated upon him over the years? Should he keep trying to fast whilst knowing that he may not be able to catch up all of those fasts or there is a time of expiration?