K-on! I Really pag-ibig that Anime and their Band HTT with their music!! and since i really pag-ibig music~!! (especially K-on!'s music) then just listening to their music calms me down and clears my mind.Just yesterday i had this problem...i got really nervous and started freaking out! but then i listened to this and it really calmed me down~ (Mugi's song really calms me down cause she has a sweet caring voice~ but Every song works~!!)
also Azumanga Daioh! and Hayate no Gotoku!
(p.s. i can tell that the one who made this video is a tagahanga of Ritsu's...)
I don't have one specific one. When I'm depressed I like to watch something lighthearted and funny out of the anime I own on dvd. Usually it's Lucky Star, K-on or Pokemon. Sometimes I also like to watch action comedies like Bleach.