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castling early is a  dangerous  business, especially if you are not familiar with the attacking patterns against a castled king. so if I was black, I wouldn't play that h6 move even against a lower rated player! anybody rated above 1300 has seen some good checkmates against a castled king that is exposed. you should never voluntarily expose your own king to attack! quite basic stuff. 

You could have played Bxf6 and won a piece. A way that might help you calculate that is if a player makes the first capture and the last capture in a sequence, then that player did more captures (might sound obvious).

So after ...h6 white wins a piece with Bxf6 Bxf3 Bxe7 Bxd1 Bxd8 Raxd8 Rad1 white has an extra bishop.

Just post the link to the game. Or click on the download button, copy the PGN and post a it as a diagram on the forums next time.

As long as you know what you're choosing between during the game. Some advantages are easier to keep than others