It’s a shame you are sensitive to Vagifem, which means it’s a case of trial and error until you get a regime that suits you.
Ovestin cream would be the next to try but mix with a moisturiser, you could try mixing moisturiser with the Vagifem too. Start of gently until your body accepts the fillers in these treatments.
You have tried Yes, try Sylk and see if that is more acceptable to you.
Do a search on here, there are so many threads on this subject, you will end up with strained eyesight but you will find lots of answers, I found it such a great help in the past.
D-Mannose is good for keeping the bladder clean but you don’t have a UTI because everything is coming back clear, with the amount of water you are drinking your bladder should be clean, but agree with CLKD, you can drink too much water thus getting rid of the good bugs/enzymes too.