1997 Ford Thunderbird main bearings problem

1997 Ford Thunderbird mileage: 79,000. I was recently told that my car has a main bearings problem. It is still running, but I was told to expect the engine to blow a rod anytime now. I have been diligent in doing oil changes every 3000-4000 miles, and also in other routine maintenance. The car has never run low on coolant. Ford had a safety recall for head gasket problem potential and did a fix on my car about 10,000 miles back. Before the repair, the thermostat registered slightly above mid-mark. After the repair, the gauge reads midway or slightly below. Is there any significance to this? Could there be a connection between the bearings problem and the head gasket defect? I appreciate your advice.