My iPhone has been hacked

there is like two phones hooked to my one phone. It goes back-and-forth when I swipe the screen it won’t allow me to do certain options like family sharing, and as well my Apple Music is saying it took to a different id and it keeps on syncing to Apple Music I keep on erasing it it keeps on happening over and over and over again please help it’s created havoc in my life. I’m not a computer wizard and this stuff gets so confusing. I’m going crazy. please help me please. I’m on the edge of insanity.

[Re-Titled by Moderator]