Hi Jaybla
Unfortunately low moods are one of the consequences of menopause due to oestrogen depletion - and in the absence of any other reason for them. it can also make you less able to cope with life events too.
In your position I would seriously consider HRT - because you went through menopause several years before the average age of natural menopause of 51/52 - so a few years of extra protection for your bones and heart are likely to be beneficial and you are still well within the right time frame for it. This should eventually help with your moods if you find the right product.
After so long without oestrogen it may take a while to settle, so if you go down this route I would start gently and ease yourself into it while your body adjusts. All the different types are listed under Treatments tab (top green banner).
Great that you are keeping fit - so important at this stage of life.
If we can help in any other way then please ask
Hurdity x