Hi can anyone please help me unravel what's happening?
Looking back I have been feeling more worn out last couple of years, especially in run up to period. I put this down to peri menopause, lockdowns etc. Have been feeling the cold more for last ten years really but very bad last winter.
The thing that made me contact doctor is sudden dip in energy couple of weeks ago. One day I was doing a lot of lifting in the garden, later in the week I was worn out decorating a cake.
I've had blood tests done and doctor says nothing needed to follow up. 
This weekend I've felt awful, drained of energy. In the past I have been depressed and also I have 3 kids and this is nothing like it, it's like my engine is somehow failing. This morning I felt sick from tiredness and sleeping doesn't seem to replenish me. 
I've been taking vit D supplements for a few years- level is 71.8 nmol/L. So this seems ok?
We have strong history of under active thyroid and honestly thought this would bring a result but TSH is 2.2 mu/L so this seems ok too.
B12 looks a bit low - 228ng/L (range 211-911) and ferritin 42ug/L (range 10-291).
I need to go back to doctor but not sure whether to push down hormone route? Maybe I need HRT? Or is this low B12 and I should ask for supplement advice?
Other symptoms are constipation, skin more dry, brain fog, I have had a slightly numb back of one hand for a couple of years, loss of libido, but I honestly think these symptoms can be shoe horned into a lot of conditions.
Please can you share any experience of any of this and what might be most useful to look into? Thank you