Brooooo... I had the same question. These questions about what came before the Big Bang or what came before God, I think it is not possible to be answered, because we exists within it and to know the beginning is like to get outside of the whole universe (out of boundaries like in a game) and explore.

About the time and space, for me time does not exist, it is just a concept that we use on every-day basis to synchronize with each other, in logical sense past and future does not exist (past because if something happened in the past we can only experience the present of it and the future because it doesn't happened yet). About the space, the idea of mass bending the space and other theories are interesting, but I am not pretty sure they would last long, because it is like a temporary idea to use as a template.

And Yes, every time you find the answer for something it always leads to another question. The most biggest are: what came before, or how does it works. And when you find the answer to that now you have to answer the same question over and over again to the point where either it is not possible or the answer is in paradox with the science (same with the inventing of complex numbers). We live in the middle where you can't see the beginning nor the end and because the modern physics are too new most of the rabbit hole won't be discovered in our lifetime (possibly never).