What Do Stabbing Pain In Head, Mood Swings And Depression Suggest?

Hi, I get an intense pain in my head, it is not like a headache, more like a stabbing pain, that will not last more than five minutes but will return. Also feel sick alot: faint, weak, nauseous. I also have been having mood swing, I feel angry for no reason, also feel sad. I have shut out the few friends I have, I love them deerly but I feel paraniod that they talk about me. I also have become very annoyed, very easily. I don't know what I'm going through? I am twenty, female, I have been through alot of tramatic experiences in my life. Do you think there is something wrong or is it in my head?