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Doesn't sound good. But it could be something simple too.
I suggest you do two things first. Drain the oil and open up the oil filter. Remove the plug in the bottom of the case as well. Hopefully it clean oil. Trash in the oil, forget about what from, the engine needs to come apart.
Remove the spark plugs and look at the plugs for signs of detonation. This should make the engine turn over easier. You can then do a leak down and see if you have a piston/cylinder issue. Typically if you have lost side clearance, the leak down with show air escaping past the rings and out through the breather. If you have a borescope you can check the cylinder too before you do the leak down.
Good luck. Hope its something simple and not the engine.
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