Well as the consequence of a mistake can be pretty bad at this point, I would someone locally with a bit more knowledge of wiring as covers and outlets are going to need to come off and be checked.. Just not worth getting hurt, or starting a fire to save a few bucks...
what does not make sense is that you "tested" the GFCI units and I do not think they will test correctly on a dead circuit.. if there is no power, they will not "pop" perhaps you have a bad unit (I have to wire my aquariums for GFCI and often run a new circuit for them as they can pull an easy 10-15 amps)
what does not make sense is that you "tested" the GFCI units and I do not think they will test correctly on a dead circuit.. if there is no power, they will not "pop" perhaps you have a bad unit (I have to wire my aquariums for GFCI and often run a new circuit for them as they can pull an easy 10-15 amps)