Euphobia

‘Euphobia’ is a word that literally means ‘fear of (the) good’. 
It has has somehow come to mean ‘fear of good news’ in some recent (as of Apr 2018) dictionaries.
Etymology: Ancient Greek εὖ (eû, “well, good”) + -phobia
Urban Dictionary {fear of good news; inability to share in someone else's happiness or to enjoy any happiness of one's own. } best probably renamed as something else. 
See also: Euneuphboia.