You can have a very real fear of Halloween — it’s called samhainophobia.
Forbes defines samhainophobia as “a persistent, abnormal, and unwarranted fear of Halloween, despite conscious understanding by the phobic individual and reassurance by others that there is no danger.”
But don’t get it confused with simply not wanting to dress up or pass out candy – samhainophobia is a clinical, psychological condition, much like arachnophobia or agoraphobia. There are treatments available for it.