Either way, it's time to tear down your engine. If it IS the con rod, you'll more than likely have to replace the sleeve, and very possibly the head, from the way you describe it.
In the future, don't seek advise from the guy who sells parts, but come to this forum and ask those who actually USE them.
Take your engine apart and let us know what the damage is, and we'll let you know what you'll need to do.