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You could have two or three different problems here.
1. White smoke from the exhaust in great amounts indicates coolant burning off. Has the coolant level dropped? Check the expansion tank in the rear trunk. While you're there, pull the dipstick and see if there's any evidence of water droplets or "milky" oil on it, indicating coolant mixing with oil. Blue smoke from the exhaust that smells like oil burning is an indication of possible oil seperator failure.
2. The squealing you hear could be a pulley, a bad water pump, or a failing oil seperator.
3. Your car running hotter could be due to blocked radiators, low coolant, or an air bubble in the coolant jacket caused by leakage. I suppose it could also be caused by the water pump failing.
You should get your car to a qualified mechanic ASAP.
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