Hi Rubylove
The post-menopausal phase can last for 40 years in some women and if you go through menopause ( ie last period) before the natural average age of menopause then it is definitely advised to take HRT to help protect heart and bones. Whether you will have the same energy as before does depend as Annie0710 said - on getting the right HRT. Some women for example can go on having flushes and sweats for many years ( without HRT) whereas others who don't take HRT feel fine. Other problems can appear later though including vaginal atrophy and osteoporosis, that may not be attributed to menopause. Energy levels do decline with age so it is not possible to be exactly the same as before.
If you periods are few and far between and you are getting flushes and sweats then definitely time to start HRT if you are able to take it. Otherwise maybe consider it when you are further down the line, but in the meantime take positive steps to improve your health and well-being for the future - ie re diet, body weight, exercise, fresh air, sleep, alcohol, work/life balance etc. Lifestyle changes (if necessary) made now, permanently, will pay dividends for how you cope with the coming years.
In answer to your wanting to hear about women on HRT - I have been taking HRT for more than 10 years (after dallying a bit with phyto-oestrogens and diet + herbal supplements to no avail) and I am now in my mid 60's and do as much as I possilby can - well I am retired but still - I eat a very healthy diet, keep my weight within healthy limits. I have never looked back and do not regret taking it at all. I am sure I would not be able to do half of what I do without it.
Hurdity x