Using Oestrogen Cream after HER2 Positive Breast Cancer

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Hi everyone

This is my first time posting on here.   I had HER2 breast cancer with mastectomy, lymph node clearance, 6 x chemo and 15 x radiotherapy and I have just had my last herceptin and pertuzamab injectionBlush

My hair has grown back like a curly mop, my nail still snap off in the slightest breeze and my eyebrows are growing back in ten different directions but I couldn't care!
However I am struggling with menopause symptoms which I believe come courtesy of Tamoxifen.   I have chronic urges to go for a wee when I don't need to go, I've had countless UTIs and cystitis, have been hospitalised three times with haemorragic cystitis and am on antibiotics every few weeks.  I rarely have more than 90 minutes sleep in one go each night as I am constantly woken by hot flushes and sex is so uncomfortable I'd rather clean the oven.  

I know HRT is out of the question and don't want to even risk it even though I follow the menospause doctor Louise Newsome on instagram who says it's not.
I mentioned these symptoms to my lovely chemo nurse the other day and she rang me yesterday to say that thinking has now changed and I could try to use a low dose vaginal
oestrogen cream (Oveston?) to help with some symptoms.  I could have jumped for joy but now today the worry wombles are kicking in and am thinking it could pose a risk.

So what I'm trying to ask in a very roundabout way is if anyone else has been HER2 positive but has any info/experience about using vaginal oestrogen cream.
Thanks so much everyone, much appreciated.
Keep smiling x