Hi Kazzie
the dose you are on is a very low dose and really not ideal for someone of your age if you are post-menopausal since it does not give sufficient bone protection. Also if you are getting flushes this confirms the dose is too low. Definitely go for the higher dose! There may be some side effects initially but do give it the full two months to settle. As for weight gain - this is something you can control through diet and exercise - cut down/out sugars and too many carbs, fatty processed foods ( if you eat them) and increase the amount of lean protein, fruit, veg, nuts etc, as well as taking regular exercise including resistance training ( low key!) to maintain muscle mass, as well as lots of walking! (Apologies if you're already doing this!)
Do let us know how you get on

Hurdity x