Mechanic says blown head gasket isn’t fixable.. Do I have to junk the car now?

I had an overheating issue with my car. No external leaks but it was apparent that some combustion gases would get into the cooling system and overheat after a 30 min drive. Took it to the shop and the mechanic says that the head gasket has blown, motors are bad and that it isn’t fixable. I already spent a good... show more I had an overheating issue with my car. No external leaks but it was apparent that some combustion gases would get into the cooling system and overheat after a 30 min drive.

Took it to the shop and the mechanic says that the head gasket has blown, motors are bad and that it isn’t fixable. I already spent a good deal of money on the car but is it really not fixable? Do I really have to junk it? Can I replace the head gasket or use a head gasket leak stop?? Anything?
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