Yammy1, welcome to MM! It sounds like your anxiety problem can be quite easily fixed with a dose of oestrogen gel. You are lucky to have had a hysterectomy because the worst part of the treatment is having to take progesterone which you will not need - many of us on here with a very bad intolerance to it.
I have never heard of fematab but if it works, stick with it but if not, I would recommend you try the gel, it really works well.
Good luck and please let us know how you get on.