I would have been furious too. So many GPs just aren't up to prescribing HRT and seem to know very little about it or the new guidelines. My personal view is that all things menopause and HRT should be taken out of GPs' hands and women should attend menopause clinics where they can get proper, meaningful advice. As CLKD so rightly points out, the message is not getting through and too many women are getting poor menopause treatment from their GPs, it comes up on here all the time.
It's easy to advise women to wave the NICE guidelines in front of these individuals but they are guidelines, not gospel and they don't have to prescribe HRT if they don't want to.
You can stay on HRT for life if you want to, that is what I am going to do and there is only one person who will make that decision and that is me.
Going forward, if she cuts up rough again, you could find another doctor in that practice if you have the time and/or inclination but if you can afford it, I wouldn't bother, I would seek help privately and get some advice from someone who actually knows what they are talking about. In most cases, menopause specialists will write to your doctor with their recommended prescription and you should be able to get your prescription on the NHS thereafter. She will struggle to argue with someone who is more knowledgeable than herself. I know it means spending money but (as long as you can afford it) what else are you going to spend it on that is more important that your health?