Author and doctor of clinical psychology Carolyn Kaufman has released a one-page body language cheat sheet of psychological “tells” (PDF link) fiction writers can use to dress their characters.
This is something I have always encouraged people to consider when writing. If you can afford it, and you have one in your area - TAKE A BODY LANGUAGE CLASS. It will open your eyes to a whole new world of subtleties you never knew existed. SO worth it as a “Real Life” skill and for all those times when you’re writing and you need your character to react nonverbally.
There is also, in addition to these others, the writer resource book: The Emotion Thesaurus by Angela Ackerman and Becca Puglisi
This is how you show, not tell what your character is feeling.