I am long term breastfeeding and having menopausal symptoms as you describe.
I had them 5 years ago (am now 43), and was diagnosed menopausal by the GP, then seeing a nutritionist whilst completing my Herbal exams, she told me I was suffering from Adrenal exhaustion. I had a lab test which confirmed this to be right.
2 months later I fell pregnant!
14 months after her birth I was back to square one and have been fighting it for the last 18 months.
It maybe worth looking into for yourself, although the gp will not register it as a problem, unless they are functioning so badly that you have Addissons disease.
Although I truly love still feeding my daughter I do wonder if the long term feeding is draining me and leaving me with this problem, I just can’t face believing that and being forced to make the decision to stop!
I shall think of you tonight when I am struggling too.
K x