As VA is due to lack of oestrogen, it is chronic and will need permanent maintenance. But this is fine, we do the same for our faces, teeth, etc. You can try using the Ovestin three times a week, and can also use some externally. It is very low dose and will not do you any harm. If things don't improve your GP may want to try you on Vagifem, in which case you can still use Ovestin externally. Perhaps a good vaginal moisturiser and/or a barrier ointment such as Hydromol or Epaderm might also help.
There is a private Vaginal Atrophy Facebook support group which is well worth joining.
JP x