@rosebandvar,
Welcome to Able2Know.
I'm thinking you're a very passionate woman : all those evocative references made me tingle.
I far prefer your first sally, and its bittersweet nod to the dvandva, pardon the pun rosebandvar.
Nostalgia refers to pleasant memories , wistfully seeking to return to happy times, so I imagine you mean reminisce ( and in any case you've already mentioned remembering in the first part of the sentence).
Maybe something like :
The sweet memories of the children at Reyhaneh blend with the bitter reality of the situation.