Time to remove the timing cover and inspect the crankshaft. If it was run loose for very long at all you will likely need another crankshaft and balancer.
Exactly. The bolt doesn't hold the damper on, press fit does. You should have had to use a tool to install it, unless you used the BFH method, which I know is popular in some circles.
If it was loose for very long, chance are you will need a new crank. Or, you can have the snout welded up and sized to spec. But that is probably more than a new crank.