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I am really sorry to hear about the problem you are having with your air conditioner
The E4 error code is indicating there is a problem with the water tank or drain. It is telling you that the tank is not draining.
I would first look at the drain hose and see if is not clogged with mold. If the drain line is clogged, be sure to move the unit where it can drain, as water will come draining out when you remove the hose. If that happens, then the drain line is clogged for sure, and you will have to clear the clog. If you get no water out of the drain pipe, then the next thing to check is the float switch
on the holding tank. This will be more involved as you will have to take the unit apart to access the tank.
The other problem you have is that even though your unit is a GE, they are imported for sale here is the states, and there is only a very few functional parts that you can order and most will have to be ordered.
Hopefully it is just the drain hose.
Advise me of what you find.