Big Bang Found

Yes, we do. From an evolutionary viewpoint, human reproduction - in all of its various facets - is more important than the shape of the room it's done in.

You should be standing on their shoulders, like Newton.

Several years ago I witnessed a phenomenon in which snowballs formed spontaneously on everybody's lawn. It's a rare phenomenon requiring exact wind and temperature conditions but it is a well-understood phenomenon.The laws of nature "caused" those snowballs without the intervention of any outside entity (though it was tempting to think that it was some kind of gigantic prank).The laws of nature don't have to "come from" anywhere. They just are. They're properties of nature, just like wind conditions and snow conditions. Anything that exists will have properties whether anybody/anything "puts" them there or not.

There is no "prior to the Big Bang", just like - as somebody else has noted - there is no "north of the North Pole". Are there laws of nature north of the North Pole?

Perhaps there's an eternal straw for us to clutch at.

I don't think that's clear at all. You seem to be using the word "dimension" to refer to some spooky woo place - another world, as it were, or an alternate universe. In fact, the word "dimension" already has a real meaning.