Well, all of this is incredibly abstract and might not make any sense, but that's kind of the point. When I get this feeling (which I kind of wrongly referenced to as nostalgia, but it places somewhere in that category of emotion), I basically can't handle the amount of thought and emotion that is convulsing through my brain. The way it feels is very different each time. Sometimes it feels like a cliché ending of a movie, standing on seemingly infinite grass plains, the sun is settling down, everything is colored in a shade of golden light. It makes me feel happy, but somehow lonely, as if I had completed an adventure to which I had a lot of personal ties to.
Sometimes I feel like walking among huge futuristic buildings, the wind whistles, cold and cruel, and I feel like I've been frozen to my core, an empty human shell, born and raised into the wrong world, perhaps the only one to see the harsh truth, through and through full of negativity, whatever the actual truth might be.
Sometimes I gaze upon the stars and my brain tries to wrap itself around the dimensions of this universe, only to hit an invisible barrier, which indicates that my brain has reached its limit as to what I can perceive.
As you can see, it's just a wild mash-up of emotions and abstract ideas. I know it's very unspecific, but that's the closest I get to nostalgia, because honestly I hardly ever miss my past, not because it was so horrible, but because I hate stagnation, I need to move on. Of course I don't always think in this intricate and abstract way, I just like to thing about things "normally" aswell, but everything gets amplified if I'm in the "right mood" for it.
That's the best explanation I gave give as of now. Right now I don't feel this way, which makes it way harder to describe what's going on, but I didn't want to wait until I have one of these epiphanies again.
Sorry for the chaotic and lenghty read!