I do wish that GPs would keep to their remit

If a regime is working then don't alter - if other symptoms arise, refer to the appropriate specialist. This goes across the board for all conditions.
Get on a Menopause Clinic waiting list. Ring your Surgery and ask to be referred as you are aware that there are long waiting lists. I would also go back on the regime which worked!
Low libedo happens at any age and 4 me it was hormonally based though my GP at the time [1978] told me that I was depressed. Yep. Depressed because GPs weren't listening

that's better

can U tell it makes me angry even now!
Let us know how you get on.