It appears the walls were closed in on you, but white could actually not pull off an effective attack because of the extremely well placed Knight.
After looking at the postion, White could have turned his Blunder"into capturing blacks queen, but it would not be worth it due to the fact that it only leaves White his queen and pawns. For example...
I'm pretty sure I would've lost this game if my opponent didnt make a blunder at the end.