Hi mommaberyl
Sorry to hear about your mood swings. Do you mind my asking how old you are - as you have been without periods for three years? Usually at this point the hormones (specifically oestrogen) have got to their lowest level and will no longer be fluctuating - in contrast to what they were doing during peri-menopause - so perhaps surprising still to experience this. However I'm sure there are other factors which cause a change in mood too!
Do you have any other symptoms of menopause, and have you had blood tests to check everything generally eg re thyroid, and vitamin levels, blood sugar?
Depending on you diet also sometimes blood sugar changes can lead to mood changes/irritability - and this can be helped by cutting out or reducing refined sugars and carbs from your diet, and eating slow release foods little and often. Just a thought anyway.
Hurdity x