Fanniption
A severe fit of hysteria, rage, or other powerful emotion due to intense feeling over a certain character or fandom; a conniption over a fandom.
"When I saw Tom Hiddleston as Loki at the 2013 Comic Con I had a total fanniption."
"Girls who have fanniptions over Twilight are so strange."
"Girls who have fanniptions over Twilight are so strange."