I Feel Crazy

I don't know what's wrong with me. Today I realized everything in my life is at an all time low. My artwork is terrible, my schoolwork is even worse,I cant eat, my health is deteriorating, I keep having awful nightmares, I'm awkward with people, my family thinks I've forgotten about them because I always have so much schoolwork. And worst of all, the boy I love is taken. Its really deteriorating me, but its weird because when I'm talking to him, its the only time I feel normal. He is amazing. And lately it seems like I've been worshipping him and the ground he walks on, and I know I shouldn't. I just have the most intrusive thoughts about him. Good ones, but they creep up at the least opportune time and I feel like people can read my mind. Especially his gf. Every time I walk by her, I've got to pull my hood up and turn my music up so she doesn't suspect anything. Not that she has reason to,I'm pleased with my ability to not cross any lines with that. But he has. Hes always flirting with me and staring at me. Its a long story. Nonetheless, I'm always afraid I'm gonna run into her somewhere and she's gonna have something smart to say. I'm really trying not to get upset about it. First of all I don't know her from a can of paint. Second of all, there's nothing I can do about it. I haven't had any negative salty feelings towards her directly. Its just the situation in general makes me want to break stuff. And I feel so stupid for wasting so much time on him knowing I don't have a chance in hell. When im falling asleep i can literally hear his voice. And then I have intrusive thoughts about how they interact as a couple and it honestly makes me want to scream. My mind is always screaming these things at me and it scares the hell out of me. There are certain parts of songs I can't listen to because they trigger such thoughts. I'm really trying to get past it. I know I'm stupid and crazy for feeling this way. But what do you think? Should I get it checked out?