A 'good tactic' by White gone wrong

I was playing White in this position. White had a winning position before he played the move 1. Qxd6?? capturing a knight on d6 (White's queen was on g3 initially before White made the capture). White had so many winning variations to continue from that position, but of all the possible moves for White, I stupidly chose the 'immediately winning' move, thinking I had bagged the game easily. Yes, it is immediately winning, for Black! How would Black handle the situation to say goodbye to White?

Unfortunately for Black, he missed the correct and only continuation in time trouble to win the game (he had only 32 seconds left on the clock) and White emerged a piece up in the end.

@IcyAvaleigh

That is correct, f2+ is the only winning move for Black. I missed this idea while playing the game, thinking that any reasonable-looking move by White should win, including this move that eventually revealed itself to be a blunder. I confidently played this move without realising that it was Black's game. Most other reasonable-looking moves win for White. Actually if I was playing as Black, I would probably have resigned after not being able to find this saving move within a few seconds. Here f2+ works as a zwischenzug because it attracts the White king to the f2 square, whereupon the subsequent rook capture Rxe2+ comes with check. The move Kxf2 is the best option, but to us, it is just as good as resigning. According to the Stockfish program, most other moves lead to mate in a few turns.

f2+ is very powerful - if the Rook captures, Rxe1+ and Black then picks up the White Queen; if the King moves to f1 or h1 then ...fxe1+ Rxe1 Rxe1+ Kxe1 (or Kh2 if White played Kh1) Qxd6. And if White tries Kh2, the Qxd6+! picks up a huge sum of material.