Re: How Come Energy Always Existed But Nothing Can Come Out Of Nowhere?
Lawerence M.Krauss wrote a book about it, based on a lecture he gave at a university, that is why is there something rather than nothing. He makes the argument something was bound to "exist" and nothing would not continue to be nothing.
From my very little understanding of particle physics, particles gain mass when they pass through Higgs field. So in addition to masses and energy, you also need to think about effect of energies and forces, the fields.
Basically, things interact with other things and then we get something. They are making concepts of masses and energy more complex in physics.