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It does sound like your RCD is dead or you are off supply upstream of that. Once that is sorted, if you still have the RCD tripping you can also start by turning off all other breakers before resetting the RCD then start turning them back on one at a time to find which circuit is causing the trip. After that you could start unplugging appliances on that circuit until you find the culprit.
You say that the meter reads zero for your unit? Do you mean there is no supply there? The supply fuse upstream of the meter may be blown, in which case there is probably a really crook appliance at fault that may be drawing really excessive current, but you would hope one of your own breakers would trip (I assume you have a breaker board and not an ild style fuse board?) before the supply fuse popped.
If the supply fuse for you rmeter has blown then nothing you do at your board will make any difference.
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