There are alot of side effects when you start any new medication, usually once your body gets used to it they stop. Don't give up yet, the benefits of using local estrogen now before it gets worse are worth persevering through a few side effects. It's good the doctors have checked all is ok too.
I was totally ignorant to VA and was in a right mess before I got treatment, never heard of it before. It also caused a prolapse. Took a year before i could sit down without using a medical doughnut. Been taking it 7 years now and living a normal life.
There are other treatments, Ovestin cream and Estring if need to change.
Hope one of them work out for you soon.