I don't feel any despair from reading Terry Pratchett's work. I rather feel pleasure by reading it and laughing about various jokes.
I don't think the solution you are seeking is found in fiction. If professional mental health services aren't easily available for you how about CBT workbooks like David Burn's The Feeling Good Handbook?
TP's work used to be a delight, but there's a very strange disconnect between the cynicism of the characters and setting, and the optimism of the stories themselves, that leaves a bad taste in my mouth. So TP is a bit like eating a lot of cake: sooner or later your tongue starts feeling weird.
This is the monthly thread for posting media of various types that you've found that you enjoy. Post what you're reading, listening to, watching, and your opinion of it. Post recommendations to blogs. Post whatever media you feel like discussing! To see previous recommendations, check out the older threads.
Rules: