Bipolar disorder is a very unpleasant, difficult psychotic disorder wherein two phases are in constant flux. One phase is "manic" and the other is "depressive". During the manic phase, patients experience unreasonable anger or happiness; during the depressive phase, patients experience unreasonable sadness. A person with bipolar disorder (or any kind of psychosis), however, remains unaware of the condition.

It is possible that you might be experiencing an anxiety disorder wherein the anxiety is manifested with anger. You can visit your GP first and then you may see a mental health professional or psychiatrist, as reccommended. Anxiolitic drugs (diazepam, bromazepam etc.) might be of use to you, as prescribed by a doctor.