Meaning of Nostalgia

In crowd and in vacuum, in summer and in blooms,
In solo presence, in hazy effervescence there is just one face which booms,
I just see a face and nothing else,
People say I'm struck by a mania,
How do I make nerdy heads understand the meaning of nostalgia?

Though alone, my hand finds itself clasped with hers,
Living without her is just a curse,
Breathing in present, I live in the past,
How do I make loveless hearts understand the meaning of nostalgia?

In the world of love, it’s just me and her with everything else frost,
Not I in the world, but the world within me is lost.
Nothing is dark, when she is around there's a radiant euphoria,
How do I make the blind world understand the meaning of nostalgia?