"Awfully" or "awful"?
I believe that the person who suggested you should use 'awful bad' has an awfully bad command of English and it would be an awful idea to abandon the correct use of 'awfully' as in your exemplary sentence:
Your snoring is awfully bad.
Just in case we’re still pursuing this, the OED’s earliest citation for the use of awful as an adverb is dated 1818. There are subsequent citations from Mark Twain and Anthony Trollope.