I've got a theory here, guys.

there is some evidence for the multiverse. The maths seems the allow such a possibility and some say that the abnormal cold spot (forgot what It was called) in our observable universe could be the boundary where two universes meet. (BTW I am not an expert)

So we're learning about evidence for the big bang and all that in physics at the moment, and I'm not a fan. Don't like the whole oh yes everything comes from somewhere except this tiny pinhead of a hot ball which is just always there and never came from anywhere ya know.

My theory, is that our universe is sort of like a galaxy in some bigger universe. Maybe we did expand from some pinhead sized thing, but what if that pinhead is part of a bigger universe where there are multiple of these smaller universes collapsing and expanding and moving all the time.

What do you guys think? Is there even any evidence for a theory like this such as stars of galaxies in our own universe doing a similar thing?

oh yeesss, my theory has some minor backing to it. This is good good news

Repeating existing ideas is not "backing for your theory".