Vaginal atrophy can be treated as a single condition without other HRT.
Ask your surgery for 'vagifem' which is delivered into the vagina via a pessary: and 'ovestin' to smear on the outer labia: I use this internally and externally via an applicator. The idea being to use either for at least 2-3 weeks nightly. Some require it every night, some manage with occasional use, i.e. very 3/4 and 6/7 nights. It really is Trial and Error at times.
You don't need an exam for this nor is using the two 'too much oestrogen'. Let us know how you get on.