Sadly, I don't think there is a natural alternative to Vagifem/Ovestin - not one that is effective long-term anyway. While I was waiting to be diagnosed, I tried Sea Buckthorn, dietary changes, wearing loose clothing, not washing with harsh products etc, etc, etc, but I was still in a lot of pain by the time the GP agreed diagnosis and prescribed Ovestin for me. I still do these things as I think it can only help, but I would never want to rely on them totally. VA is treatable but NOT reversible, so to my way of thinking, it's not worth risking messing around with alternatives because by the time I realise it's not working, I will have got worse.
It may feel worse for the first few weeks of use - I was so sore by the time I started using Ovestin, that I think anything would have irritated the tissue there at first. But within a couple of weeks, it was much better.
BTW, I can recommend Faith in Nature's feminine wash. I used to use Vagisil, but found it could 'burn' sometimes if I was having a bad day, but I've been using FiN for months and not had any discomfort at all. Worth a try for anyone who can't bear to use nothing and finds the Vagisil irritating.