Serves me right for drawing. What makes it more painful is that I knew I needed to slow down - the time pressure was all in my head. Had I simply got up, walked out, breathed deeply and took my time to assess the position, I would have won (most likely). Instead, I rushed into it and didn't even consider the perpetual check or even the loss. I was still lucky to even get a draw out of it after my failure to take time to assess.
Anyway, here it is; and here is the key position (at least for me):
It took me two days to finally come back to this game and look at this position - it was really burning me up inside.
...Kf6 ... the knight is pinned and I my queen is on the right diagonal to defend against the black queen check. My pawn is then free to capture the knight and I'm up a full rook.
What puts a burr up my butt is my failure to even analyze the perpetual check and potential loss - instead I succumbed to the perceived time pressure and went with the immediate knight capture.
I know how to not be rattled. I've got to learn how to recognize when I'm being rattled. From there, I can just right the ship.