Hi Tas and welcome!
I am pretty new here myself, responding as I have similar symptoms to you and am around your age - overwhelming anxiety etc - and have been doing well on Femoston (now on 2/10, I still felt pretty anxious on 1/10 although much better). Also seems to help with dryness, libido, etc - this has been slower to improve though, a few months. Like you I'd be too scared to take Prempak - as far as I know it's an old-style, equine oestrogen (implicated in health risks although I realise some women do fine on it). Femoston though is as good as bioidentical - the oestrogen in it is estradiol so bioidentical, and the progesterone, dydrogesterone, is as good as biodentical. I've done a lot of research and seems Femoston is as safe as bioidentical patches/gel - it shows no increase of risk in bc, heart attack, stroke, etc (at least over 7 years). That said, there's not much research that's been done. Also, though it's sequential not continuous, doesn't seem to bother some of the post-meno (I'm still peri) ladies on here who take it. So anyway, you might want to consider it? Good luck!