(n) Depression brought on by nostalgia, The theory that a song,smell,type of weather etc can cause a temporary depression relating to a longing to be back in that lost moment be it good or bad.

(depralgic)(adj)

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.