Nostalgic confusion

I decided to keep this as one block of writing. I think to just add effect to the poem, it doesn't change in this moment but one day everything will have changed and this moment will just be a memory.

And suddenly we realised we were sharing a moment which we would both remember for years to come. A moment in which we felt nostalgic about even when we were living it right there and then. We lived in this moment and we thrived in this moment, but we both knew it had to end at some point. We didn't want to think about it but we both knew. We both knew that it wouldn't last forever but, I wonder, would we really want it to? Deep down in the pit of our stomach, would we really want it to last forever?

Author's Note

Do you think I should have set it out differently? I had trouble with describing the pit of a stomach - any suggestions?