This means that you are mentally and physically obsessed with Tom Felton and you can’t get over your self about him and your mental health is so bad because you have mentallyobsessedwithtomfelton-itis.
Friend: Omg I have mentallyobsessedwithtomfelton-itis.
Sidekick-itis (Sidekick - eye - tiss), as coined by LindsayEllis, is a word for a phenomenon that occurs in (usually fictional) media, where said media has (or what is considered) to be an overabundance of "sidekick" characters.
"This movie has a bad case of sidekick-itis, even the sidekick has a sidekick!"
Friend: buy the dip and hold!
Me: Yeah! IT'S ALL ABOUT THE DEGENS BABY!
Friend: How many times a week do you watch Crypto Banter?
Me: Yes!
Friend: u got a bad case of DEGEN-ITIS