What is wrong with me? Should I go see a doctor?

[Ginny]

Hello, well im 15 years old to start off and I CANT stand being alone like i freak out and i start to shake and i just developed this recently like being alone terrifies me i feel like someone is going to kill me and that only way i can calm myself down is if i turn on music really loud and just try to focus on it but im still scared in the back of my mind, also certain things have to be in a certain way or else i go freaking insane until the point where i have to fix it and sometimes i have to bark like a dog or make an extremely weird noise and if i down it eats me up inside until i make it also sometimes i just HAVE to move my hand and i just cant stop like i have to move it and somebody has to literally grab it for me to stop or it goes on for about 2-3 minutes