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"solastalgia," a combination of the Latin word solacium (comfort) and the Greek root - algia
In a 2004 essay, he coined a term to describe it: "solastalgia," a combination of the Latin word solacium (comfort) and the Greek root - algia (pain), which he defined as "the pain experienced when there is recognition that the place where one resides and that one loves is under immediate assault ... a form of homesickness one gets when one is still at 'home.'
Quite apart from issues of spelling consistency (you have 'solostalgia', where the original article you excerpt seems to have 'solastalgia'), it is notoriously bad form to combine Latin (solacium) and Greek ('algia') root words (OK, there have been some 'successes' - television the most conspicuous - but in general it is crassly inelegant and unnecessary).
I'm sure there must be a better and more appropriate term for 'familiarity' in either Latin or Greek than 'solacium'; but, being a rather out-of-practice Classicist, I can't think what it would be for the moment.
It's a mashup of the roots solacium (comfort) and algia (pain), which together aptly conjure the word nostalgia.
Vnum erat mihi solacium, quia quum persensi cupiditatem eorum, ego subtraxi de libris Biblium et sententias, et alios libros quos magis diligebam.