Factually, though, neither is correct. 'Massive', despite continuous misuse by news readers and alleged journalists, is not a synonym for 'huge' (or 'hugh' either :^) ). The word's principal meaning is 'weighty' or 'having great weight'. Therefore, the former usage would imply that you will have SERIOUS health problems in the future, and the latter that you probably are a candidate for inclusion in the Guiness Book of Records, under 'World's Heaviest Hair'.
Adverb, actually, and so it would modify the adjective as you said while the adjective modifies the noun. Can this single sentence be used to illustrate all the rules of grammar? Starting to look that way.