All this for a pawn?!?! (maybe more?)

Hi people, first blog post here.

The following is a position from a game I've played recently. I played as black. At this position my opponent saw that he could win material, but failed at his attempt and I ended up successfully counter-attacking in a "biter bit" fashion.

But he had something better to play. Maybe you can find the right play and win material out of this position?

Winning a rook and two pawns for a knight and a bishop. Not clear that white is winning after this but the pawn down in material was taken back (from a purely materialistic point of view).

Hope you've enjoyed these interesting tactics. Below I'm showing the whole game and how the position actually developed in the game, where I ended up winning a piece.