A common English error is to misuse the words good and well. The rule of thumb is that good is an adjective and well is an adverb. Good modifies a noun; something can be or seem good. Well modifies a verb; an action can be done well. However, when you’re talking about health, well can be used as an adjective.
All you need to remember when you are pondering whether good or well is best for your sentence is that good modifies a person, place, or thing, whereas well modifies an action.