Strangely, yes, there is an irrational fear of being too happy. The name of this phobia is Cherophobia.
Generally people with the phobia fear being too happy because they are worried something tragic will happen as a result of their over-happiness.
There isn't a particular name for the fear of sadness, as it's considered a social phobia. Eremophobia is the fear of being alone, which could be similar.
Cherophobia- Fear of gaiety.
There is no official name for that.
Cherophobia
cherophobia
Ombrophobia
Ichthyophobia.
Phasmophobia
Your afraid of butter
From what I understand there is no specific phobia for people who are afraid of mail. Most just call it Mail Phobia...
Yes there is and it's called Ball phobia
Laughphobia is a phobia that means "afraid of laughing". Like when your friend fell out of their chair, you wouldn't laugh because your afraid to.. Anything that ends with the word "phobia" means afraid of.
If you're afraid of heights "Acrophobia", if you're just afraid of roller coasters "Roller Coaster Phobia".
Autophobia
dogaphobia
Cyprindaphobia
Metallophobia