I have been using citalopram very low dose since last August and it has definitely helped. Although I am still in peri menopause and only really got the anxiety mostly under control once I started hrt. Probably different for you though given you are post meno. Escitalopram is similar to citalopram, some would say it is better. You usually have a lower dose than with citalopram and side effects are meant to be less. Saying that, I am very sensitive to medication and the only real side effect I get with citalopram is a dry mouth for about 5 hours after taking it and less intense orgasms. I would definitely give another AD a try if needed, just make sure you do a proper taper from the one you are on. The GP may be able to give you something short term to use ad hoc while you make the switch, e.g. to deal with any acute anxiety that arises.