Unless you are having health problems that mean you need to stop the oestrogen, then there is no reason you can't continue indefinitely with HRT. 2mg is quite a high dose so, unless you are getting flushes, I doubt more oestrogen would help ? Maybe you need some vitamins - B12, Zinc etc can help with energy. Backache can be variety of things - a bad mattress or you may need to do some Pilates?! I wouldn't consider lowering or stopping HRT for quite some time. Poor energy levels happen even when on HRT - it's just life and ageing - but it could be worse if you came off HRT. DG x