I caught this on Facebook this morning, and wanted to keep the link around. Who knew there were words for all of these feelings?
http://www.dictionaryofobscuresorrows.com/
Favorites:
Vellichor
(n) The strange wistfulness of used bookshops.
Jouska
(n) A hypothetical conversation that you compulsively play out in your head.
Sonder
(n) The realization that each passerby has a life as vivid and complex as your own
Language is just cool.