Hi Pickle, welcome to the forum!
It is most certainly not one treatment fits all, boy are we all different! I don't know whether you have investigated the forum but if not maybe scroll through the different subjects being discussed especially any that are relevant to you and what you're experiencing.
Perimenopause is different for all of us, some women skip through whilst others have a really bad time. If you're feeling well, are happy and managing ok, there may not be a need to see a GP. If however you feel you'd like to discuss the fact that things are changing for you, by all means go. Do what's right for you and don't feel pressurised to follow any particular path because it suits or is necessary for someone else.
Some women opt for HRT, others don't, some can't take it, some don't need to. If you haven't had a period for 6 months and haven't had any problematical symptoms of peri, you may be someone who sails through easily. My mother's periods stopped very suddenly, with 2/3 hot flushes at the age of 45. Job done!! This was certainly not my experience!
I don't know your age or any details but HRT does benefit some women who have a very early menopause, helping to protect their health in later years.
If you've booked an appointment with your GP, why don't you sit down and as CLKD suggested, jot down everything that you are experiencing
and any questions you may wish to ask.
All good wishes to you, hope you sail through with no problems!