The most important thing during illness is to offer to God patience and thanksgiving for His merciful visitations. Sickness purifies sins and gives one time to meditate on the past.
It is pointless for someone to say that he has faith in God if he does not have works which go with faith. What benefit were their lamps to the foolish virgins who had no oil (Matt. 25: 1-13), namely, deeds of love and compassion?