Sorry to hear your VA is so bad. Rather then use the Ovestin every other day, you may find it more helpful to use it daily. I have to use it daily or I get bad VA symptoms.
What are you using to wash your whole body with? If you are using Hydromol to wash, then that is great. You can apply some to the vulva before you shower, wash it off in the shower, and then reapply some to act as a barrier. If you use the Hydromol to wash your whole body with then this will reduce the risk of anything irritating you too.
How long have you been using Ovestin for? For some people it takes longer to see signs of improvement. With tights I think some members buy special tights such as cotton ones as tights or leggings will be irritating to the VA.
I do not know how the gynae can tell there is no evidence of lack of oestrogen as it can be internal with no physical symptoms. It is a good idea to have the recommended scans just to ensure all is well in the bladder. I think there is a thread on here about cytoscopy's. Perhaps you can enter that into the search bar and have a browse of any threads.