I am going through the menopause and find I am angry all the time often for no reason, why is this and what can be done?

It can be difficult. The emotional response to the menopause is varied. There is a good chance your feelings are influenced by the menopause. In any case you should be seen and examined. Treatment might include hormone replacement or ssris or some other approach.
Yes. In menopause the body is no longer producing both estrogen (estradiol) and progesterone, and every cell in a woman's body has estrogen and Progesterone receptors. Mood is heavily influenced by both estrogen and progesterone. Find a doctor who does cyclic bioidentical hrt.