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sarahama,
You should be able to unplug most things in you space, with the exception of a few things. If you disconnect the main breaker, the meter should stop moving if there is no problem. Assuming the meter does stop, then every appliance should have a nameplate power draw when in operation. With the meter not moving and water heater off, (It should have a vacation setting) record the meter reading. Turn on 1 circuit at a time, and let it run for 60 seconds, turn it off, and read the meter.
Power = (final meter reading - initial meter reading)/(time in hours).
If the meter reading is in kW-hrs, then power is in kW and so on.
There is another type of meter with a wheel, which may be either Watt hrs or kWatt hrs. For these types, just count the revolutions in the 60 seconds, and use this as the (Final - Initial)
This power calculated must add up to everything on that circuit, and should add up to the total of the nameplate power of everything on that circuit assuming everything is running. If not, then some devise is faulty.
It may be as simple as the fridge is going bad and not cycling on and off as it should.
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