The endgame bamboozled me !!

I had a few rapid-play games online today.  The shocking result in my last game was that I could only manage a draw - when in fact I had a won endgame.  I think that to really improve my chess, I need to start getting to work on practicing winning endgames.  I feel that its OK to do a few endgame lessons, but when it comes to playing real games over the board, the pressure is far more intense, especially when you are up against the clock.  I've included the analysis from Move 59 of where I went wrong in this game - with a 4 vs 3 pawn majority :) 

Won endgame only drawn!