Again, a GP not knowing how to proceed, however: ones that are willing to investigate should be worth working with.
Menopause Clinics can recommend testosterone 'off licence' for symptoms, including low libedo.
One should avoid using herbal remedies along with prescribed medications. If herbals worked they would be offered by the NHS. Some find benefit for a while but as their hormonal upheaval continues, any improvements may be lost.
6 months is early to note any real improvements. You can be referred to a Clinic from the Surgery or if necessary, self referral to a private Clinic may be another option.
Some find that keeping a mood/food/symptom diary of use. Also, penetrative sex shouldn't be affecting a relationship if 1 talks about the ins and outs (see what I did there
) of arousal and ways of satisfaction ;-).