Suicidal tendency. Feeling to stop.

I have been having a very strong urge to just end my life. I just don't feel like living anymore. I've had this depressive feelings for years now. Amd recently it has gotten worse. I feel like I have anxiety attacks almost everytime I go out. I have very bad nightmare or night terrors. I'm severely paranoid. I can't stop crying everytime i go to classes. (I'm a college student). I'm experiencing severe mood swings. Sometimes I feel very detached from everything and i isolate myself. But then there are times when I'm too excited or irritated. I feel like I'm at the top of the world. Then I go crashing down and then back up again and this cycle keeps repeating and I have no idea what to do anymore. And I just want everything to stop. I'm so done with everything, with being jumpy, with having an anxiety attack all the time and I'm not stressed. I'm the opposite of stressed. I don't care enough to be stressed. I just want the uncomfortable feeling to stop.