Extensive move list so have a look. Might be tough to follow at times, but I have given 4 options at a crossroads that ended it for White.
Could have been an interesting game even after you thought you had it won.
I apologize in advance for any mistakes as I analyzed this game myself 
The Queen check combination threatening the rook occurs a lot -- in the Scotch opening if white doesn't play correctly. I think you underestimated white's attack. As the previous poster mentioned in his annotations white had a few spectacular moves that he failed to play. Overall, nice combination and great refusal of the hanging rook early on. Most players would have ripped it off the board lol
in this game i refused a rook capture at first to decimate my opponents pawn structure and keep the momentum going not allowing my opponent any time to develop all his pieces . having my queen on the 8th rank was devastating and my knight move at the end linking my rooks was a winning move . my opponent didnt do much wrong at first i just thought i played a really good intelligent game