Sounds like overkill on his part, trying to "improve" the piece.
New hardward and a sanded, refinished top? I'm afraid you've lost alot of value my friend. Can't say just how much without seeing it. Perhaps if you post some pictures using Mart's words as a guideline, we can tell more.
Sorry about your "mishap." Don't feel foolish, though. You trusted him, and he should have (at the least) called you before doing this work.