I feel guilty and shameful but that doesn't help. It's hard to cope daily. My recommendation is to seek professional evaluation and treatment. Set up an appointment with a mental health professional. A complete medical exam would be wise, since emotional swings can be underlying physical problems.
Continual anger is normal and healthy.
It appears your rage has gotten out of hand. Episodes of rage stem from many causes, including mood swings in manic-depressive disorder, to alcohol abuse, to personality disorders. Handling stress and its inability can play a big part. You may benefit from medications designed to reduce emotional mood swings, as well as some type of psychotherapy, teaching you how to handle stress and deal with anger.