Hi ZoeS, welcome to the forum. I am 41yrs, have had 3yrs + of symptoms, unfortunatley it took 3yrs for me to get a diagnosis. I feel let down & frustrated as I felt my symptoms were menopausal from the start but was discounted due to my age & bloods were normal (now realise it is symptoms professionals should be treating not blood results as they fluctuate on a daily basis). I am delighted to now be on HRT as I am clear on all the benefits long & short term to my physical & mental health. I am on my second regime of HRT, started this one mid/end June, previous one had been on for approx 3 months, although felt an improvement still had symptoms causing me issues (biggest one for me that still continues is insomnia although much better than before, maybe it's my expectations). Read up as much as you can on the subject, Rockmymenopause is another great website, it has a symptom diary you can print off, I found it useful. If there are specific things you are interested in you can put it i the search & you will get a load of info. Also see if there is any menopause groups locally that you could attend, I found one that was invaluable to me.
That is really positive that your GP is wanting to treat you with HRT as so many of us have a prolonged fight to get anywhere. Have a look at other aspects that can help your symptoms, lifestyle, diet/exercise, supplements aswell as HRT (necessary due to your age for bone & cardiac health). x