Oooohhh... That struck a chord. I love those first stanzas, how you repeat that line "During those lonely times.". Empahsizing that lonelyness really makes you feel the sadness and confusion behind this "Vague Memory".
I would say its powerful... But its not... On the contrary, its more like powerless. Just to have that warm feeling snatched away only to realize it was only a recollection of what was. I know that feeling all to well. Very moving piece of writing you have here. Kudos.