You could try Barr's "Stop Leak" if it's available, Used this once to seal a massive leak in the water pump on a new car and it lasted until a replacement pump was fitted.
See that you state loosing coolant/headgasket. If the headgasket has blown is the coolant leaking out between the head and block or leaking into the engine. If either of these doubt if any stop leak will work, suggest changing gasket before you knacker up the engine.
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