I am aware of the multiverse theory. I personally think super or ultra massive black holes may be involved but we don't know.
And as I said we'll have to see what other top physicists say about this.
If you understand the Big Bang happened around 14 billion years ago how hard is it to understand there was a time 29 billion years ago. That time did exist. This universe may not have existed but time as we know it is eternal.
The Big Bang theory is that everything including time came into existence at that moment. Before that there was nothing.
No there was always energy, energy can neither be created nor destroyed, so there never was nothing and there never will be nothing.
Let's explore that. All the energy of the universe (because there was no matter) was contained in a singularity that had nothing to restrain it from expanding (because none of the forces, including gravity, existed, even time). Is that what you're saying?
That naturally leads to the inevitable question, what put all that energy in that state if forces like gravity didn't exist to pull it together and hold it?
I think it's at least safe to say there was nothing, and no energy, in the universe because the universe itself didn't exist. The energy then had to come from outside the universe. It had to be placed in that singularity so it could expand.
And remember, we cannot allow any intelligence to be guiding any of this.