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The probable causes are unfortunately quite serious. Metal noises are never good.
There are a few big things that can break. Most will leave evidence.
Don't try to turn it over any more. If there are broken bits in the oil that make it past the filter you will just damage more stuff and pump it into the bearing journals.
Look under the car. Look for any evidence of a new leak. Sadly, look for a hole. You may have thrown a rod.
As others have said pull the spark plugs. With a bright led light and a mirror, you should be able to look into the hole and see a portion of the piston.
Of course any damage to the spark plug itself is a indicator of a major problem.
Some have bought a 10mm borescope. Maybe you can borrow one from a napa or advanced auto (any auto parts store) that would let you look deep into the cylinder, through the spark plug hole.
You might also be able to use the light in the crankcase oil drain hole to see inside.
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