Hi Stripes. It must be a shock to discover you are menopausal earlier than you probably expected. Blood tests are an unreliable way to diagnose menopause but your doctor is right that an FSH of 58 does put you in this category. It could be a mixture of stress and menopause?
At your age it is considered advisable to use HRT at least up to the more usual age of menopause which is around 51. You would merely be replacing oestrogen which should have been yours naturally. Oestrogen has a protective effect on both heart and bones and before the usual menopause age any risks are far outweighed by the benefits.
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Taz x