Do I have an anxiety (or any other kind of) disorder?

I think I might have an anxiety disorder. Ive had depression before and I'm very mildly bi-polar. Sometimes I get images in my head of my family or friends dying. I get these dreams of my brother or parents dying from things like poison or falling off of the balcony. I'm not worried about myself dying though, just them. I also have this thing where if I touch one of my fingers a certain way, I have to do the same to the rest of them. Sometimes I get this weird feeling that I cant explain and I feel like I have to bend my arms, wrists, and back to make it go away. I get really depressed often over random things, and sometimes I want to feel depressed. I cant explain any of these feelings. I get angry really easy. Things like the tone of a persons voice(not necessarily an angry tone, mostly just this voice my brother makes when we are talking about something sensitive) makes me angry and I feel like I want to kill him or myself. I cant help it. I'm only 15 and this has been going on most of my life. When I was younger, I used to cry myself to sleep and I wanted to kill myself( I dont know why).Is this normal teen angst or something? My old therapist said I should take some medications for my "anxiety". I don't feel un-normal and I don't think medicines will make me feel any different. Sometimes I want to be on all kinds of medications because it will make it seem like something is wrong with me; like I'm different or something. I'm not into drugs, so dont get the wrong idea. I dont think I'm attention starved; my parents are more involved in my life than most parents. There is other stuff, but I cant really explain it, or write it. Does it sound like I have some disorder or something? Is there a way I can show my parents without having to actually say it? Thank you.