If you adopt German words, mind of do it correctly.
We capitalize nouns, so it's Angst. While or long concatenatef nouns madness *) makes reading more difficult, capitalizing them maybe it a bit easier.
And we almost never use "tz" where a "z" will do (except in a few surnames) So it's Weltschmerz.
*) like Donaudampfschifffahrtsgesellschaftskapitänsanwärterlehrgang