Help! What are the symptoms?

Hi, I'm 21 years old and I feel like I'm going crazy. I keep thinking I hear music when there is none around (no I don't listen to music that much). My eyes sometimes feel like they're fuzzy, swollen, floating. I feel like there's some kind of chemical imbalance in my brain. I don't know. I have extreme social anxiety at times. There's been a few times that my vision has been blurred or my perifreal (sp?) vision has completely went blurry, but my head didn't start hurting until afterwards. I'm worried I might be bipolar, because it does run in my family (bipolar has been linked to genes). I'm also worried I might have a brain tumor. I know I sound paranoid, but i've looked up symptoms and I do have some of them. Can anybody tell me if they have had/ or know someone with bipolar disorder or a brain tumor? How did that person feel or act?? I know this sounds crazy, but I need some advice. The past few years i've slowly started slipping away from who u was before. I feel like I'm just a shell. Or outside of my body looking in. I Just want to feel again. Please help.