The oil pressure is dropping, and the engine seized up twice.
I hate to be the bearer of bad news, but it sounds like your engine is at about the end of its useful life. If a motor seizes, the piston has become so hot and expanded that its stuck in the bore of the combustion chamber and coupled with oil starvation is a bad mix. Have a certified mechanic from YourMechanic verify, but i would be willing to bet your engine is going to need a rebuild at least.
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