they say that the sense of ‘deja-vu’ you get is your brain incorrectly writing ‘timestamps’ relating to memories. so, theres a valid scientific reason why we get those feelings.

Sometimes yes, and I tend to get deja vu very often, occasionally its even recursive where I’m having deja vu of having deja vu.

Like watching a movie you already watched? Having no perceived control over one’s actions?

Yea that’s called depersonalization…

I imagine there are very few truly unique experiences in this life and that someone has likely been through exactly what you’re going through in a different time and place.

the last didn’t go anywhere

It happens.