I know this feeling way too well. There was a fish I snapped off three years ago and I'm still thinking about it.
I was at a small pond in Conroe, TX. I had a bladed jig micro tied onto a spinning rod. Braid to leader. I'd just respooled the reel and forgot to loosen the drag. That is the hardest thump I have ever felt. It was either a giant catfish or a giant bass. I didn't get to see it. But it would have been a PB. My 7-10 pb didn't hold a candle to that thing, whatever it was. It will haunt me until I catch a double digit bass.
Sorry for your loss there bud. It hurts. And usually there's nothing you can do but sit with the hurt.