The only possible answer is that I would eek out an existence foraging for twigs and berries as a neolithic hunter gatherer. However, in my case I would only do that for several months before I died from a chronic health condition I manage with medication, so there's that.

I don't know if it's really possible for us to go back to the stone age. There's so much steel and iron lying around. I don't really know much about metallurgy but I'm pretty sure I could figure out how to flatten some rebar into a blade if it was all I had to do all day.

We also have domesticated breeds of livestock and know how to raise crops.

So, at worst it would be some kind of modern iron age, neolithic isn't really possible.